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PKO Rotunda is a rotunda-type building owned by the PKO BP bank in the center of Warsaw, Poland. Designed from 1960–1969 by chief architect Jerzy Jakubowicz, it was the site of a gas explosion in February 1979, which killed 49 people. It was opened again in October the same year. In 2015 Warsaw officials agreed to demolish the building, although it was an officially recognised monument – it was then believed that the building was fully reconstructed in 1979, after the explosion. The branch was closed on December 23, 2016. In March 2017 the builders were ordered to stop the demolition, as after a few days it was discovered that most of the building construction is, in fact, from the original building. The building was then carefully demolished, but parts of the original constructions (the central element and the roof) were saved in order to be accommodated into the new building.A new, three-level building in the same shape was opened in November 2019 - with a two-level PKO branch and a coffeeshop at the top floor.

The 1979 explosion at PKO Bank Polski's Rotunda office in Warsaw took place on February 15, 1979, at 12:37 p.m. As a result, 49 people died and 135 were injured. Officially, the tragedy was caused by a gas explosion, but in the course of time much speculation appeared, and Varsovians talked among themselves that the building had been blown up by a bomb. Furthermore, to many the explosion served as a harbinger of future changes in Poland.

Widok Towers is an office skyscraper in Warsaw, Poland, located at 44 Jerusalem Avenue, in the Downtown district. It was designed by Piotr Bujnowski and Martin Troethan, and opened in 2020.

Jerusalem Avenue (Polish: Aleje Jerozolimskie) is one of the principal streets of the capital city of Warsaw in Poland. It runs through the City Centre along the East-West axis, linking the western borough of Wola with the bridge on the Vistula River and the borough of Praga on the other side of the river.

Centrum is a station on Line M1 of the Warsaw Metro, located under Plac Defilad, a square in the borough of Śródmieście, next to the Dmowski roundabout, where the two main streets, Marszałkowska and Aleje Jerozolimskie, intersect. It is located close to the Palace of Culture and Science and Warszawa Centralna railway station. It has two levels: the lower one contains the platforms and the upper one is a shopping mall. The station was opened on 26 May 1998 as the northern terminus of an extension from Politechnika. On 11 May 2001, the line was extended north to Ratusz.

The Chabad Lubavitch of Poland, also called the Chabad House Warsaw, Poland, is a Chabad Hasidic Jewish congregation and synagogue, located at 19/508 Słomińskiego Street, in Warsaw, in the Masovian Voivodeship of Poland. Another temple of this type in Poland (ongoing ownership disputes) is the Isaac Jakubowicz Synagogue in Kraków. The synagogue was founded in December 2005. The prayer room is part of the Jewish Centre, where a yeshiva, kosher restaurant and library are also located. The current rabbi of the synagogue is Chabad Rabbi Shalom Ber Stambler.

The Second Polish Republic, at the time officially known as the Republic of Poland, was a country in Central and Eastern Europe that existed between 1918 and 1939. The state was established in 1918, in the aftermath of the First World War. The Second Republic ceased to exist in 1939, when Poland was invaded by Nazi Germany, the Soviet Union and the Slovak Republic, marking the beginning of the European theatre of the Second World War. In 1938, the Second Republic was the sixth largest country in Europe. According to the 1921 census, the number of inhabitants was 27.2 million. By 1939, just before the outbreak of World War II, this had grown to an estimated 35.1 million. Almost a third of the population came from minority groups: 13.9% Ruthenians; 10% Ashkenazi Jews; 3.1% Belarusians; 2.3% Germans and 3.4% Czechs and Lithuanians. At the same time, a significant number of ethnic Poles lived outside the country's borders. When, after several regional conflicts, the borders of the state were finalised in 1922, Poland's neighbours were Czechoslovakia, Germany, the Free City of Danzig, Lithuania, Latvia, Romania and the Soviet Union. It had access to the Baltic Sea via a short strip of coastline either side of the city of Gdynia, known as the Polish Corridor. Between March and August 1939, Poland also shared a border with the then-Hungarian governorate of Subcarpathia. The political conditions of the Second Republic were heavily influenced by the aftermath of the First World War and conflicts with neighbouring states as well as the emergence of Nazism in Germany. The Second Republic maintained moderate economic development. The cultural hubs of interwar Poland – Warsaw, Kraków, Poznań, Wilno and Lwów – became major European cities and the sites of internationally acclaimed universities and other institutions of higher education.

Warsaw (Polish: Warszawa, [varˈʂava] (listen)), officially the Capital City of Warsaw, is the capital and largest city of Poland. The metropolis stands on the River Vistula in east-central Poland and its population is officially estimated at 1.8 million residents within a greater metropolitan area of 3.1 million residents, which makes Warsaw the 7th most-populous capital city in the European Union. The city area measures 517 km2 (200 sq mi) and comprises 18 boroughs, while the metropolitan area covers 6,100 km2 (2,355 sq mi). Warsaw is an alpha− global city, a major cultural, political and economic hub, and the country's seat of government. Its historical Old Town was designated a UNESCO World Heritage Site. Warsaw traces its origins to a small fishing town in Masovia. The city rose to prominence in the late 16th century, when Sigismund III decided to move the Polish capital and his royal court from Kraków. Warsaw served as the de facto capital of the Polish–Lithuanian Commonwealth until 1795, and subsequently as the seat of Napoleon's Duchy of Warsaw. The 19th century and its Industrial Revolution brought a demographic boom which made it one of the largest and most densely-populated cities in Europe. Known then for its elegant architecture and boulevards, Warsaw was bombed and besieged at the start of World War II in 1939. Much of the historic city was destroyed and its diverse population decimated by the Ghetto Uprising in 1943, the general Warsaw Uprising in 1944 and systematic razing. Warsaw is served by two international airports, the busiest being Warsaw Chopin and the smaller Warsaw Modlin intended for low-cost carriers. Major public transport services operating in the city include the Warsaw Metro, buses, urban-light railway and an extensive tram network. In 2012, the Economist Intelligence Unit ranked Warsaw as the 32nd most liveable city in the world. In 2017, the city came 4th in the "Business-friendly", 8th in "Human capital and life style" and topped the quality of life rankings in the region. The city is a significant centre of research and development, business process outsourcing, and information technology outsourcing. The Warsaw Stock Exchange is the largest and most important in Central and Eastern Europe. Frontex, the European Union agency for external border security as well as ODIHR, one of the principal institutions of the Organization for Security and Cooperation in Europe have their headquarters in Warsaw. Jointly with Frankfurt and Paris, Warsaw features one of the highest number of skyscrapers in the European Union, while Varso Place is the tallest building in the EU as of 2022.The city hosts the Polish Academy of Sciences, National Philharmonic Orchestra, University of Warsaw, the Warsaw University of Technology, the National Museum, Zachęta Art Gallery and the Warsaw Grand Theatre, the largest of its kind in the world. The reconstructed Old Town, which represents examples of nearly every European architectural style and historical period, was listed as a World Heritage Site by UNESCO in 1980. Other main architectural attractions include the Royal Castle and the iconic King Sigismund's Column, the Wilanów Palace, the Palace on the Isle, St. John's Cathedral, Main Market Square, as well as numerous churches and mansions along the Royal Route. Warsaw possesses thriving arts and club scenes, gourmet restaurants and large urban green spaces, with around a quarter of the city's area occupied by parks.

The Warsaw Uprising of 1794 or Warsaw Insurrection (Polish: insurekcja warszawska) was an armed insurrection by the people of Warsaw early in the Kościuszko Uprising. Supported by the Polish Army, the uprising aimed to throw off control by the Russian Empire of the Polish capital city (Warsaw). It began on 17 April 1794, soon after Tadeusz Kościuszko's victory at the Battle of Racławice. Although the Russian forces had more soldiers and better equipment, the Polish regular forces and militia, armed with rifles and sabres from the Warsaw Arsenal, inflicted heavy losses on the surprised enemy garrison. Russian soldiers found themselves under crossfire from all sides and from buildings, and several units broke early and suffered heavy casualties in their retreat. Kościuszko's envoy, Tomasz Maruszewski, and Ignacy Działyński and others had been laying the groundwork for the uprising since early 1793. They succeeded in winning popular support: the majority of Polish units stationed in Warsaw joined the ranks of the uprising. A National Militia was formed by several thousand volunteers, led by Jan Kiliński, a master shoemaker. Within hours, the fighting had spread from a single street at the western outskirts of Warsaw's Old Town to the entire city. Part of the Russian garrison was able to retreat to Powązki under the cover of Prussian cavalry, but most of it was trapped inside the city. The isolated Russian forces resisted in several areas for two more days.

The siege of Warsaw in 1939 was fought between the Polish Warsaw Army (Polish: Armia Warszawa) garrisoned and entrenched in Warsaw and the invading German Army.: 70–78 It began with huge aerial bombardments initiated by the Luftwaffe starting on September 1, 1939 following the Nazi invasion of Poland. Land fighting started on September 8, when the first German armored units reached the Wola district and south-western suburbs of the city. Despite German radio broadcasts claiming to have captured Warsaw, the initial enemy attack was repelled and soon afterwards Warsaw was placed under siege. The siege lasted until September 28, when the Polish garrison, commanded under General Walerian Czuma, officially capitulated. The following day approximately 140,000 Polish troops left the city and were taken as prisoners of war. On October 1 the Wehrmacht entered Warsaw, which started a period of German occupation that lasted until the devastating Warsaw Uprising and later until January 17, 1945, when the Wehrmacht troops abandoned the city due to the advance of Soviet forces. Around 18,000 civilians of Warsaw perished during the siege. As a result of the air bombardments, 10% of the city's buildings were entirely destroyed and further 40% were heavily damaged.: 78 Under the international rules regarding aerial warfare in 1939 Warsaw was considered a legitimate military target as the city was on the front line during the fighting and it was heavily defended by the Polish army.

The Warsaw Uprising (Polish: powstanie warszawskie; German: Warschauer Aufstand) was a major World War II operation by the Polish underground resistance to liberate Warsaw from German occupation. It occurred in the summer of 1944, and it was led by the Polish resistance Home Army (Polish: Armia Krajowa). The uprising was timed to coincide with the retreat of the German forces from Poland ahead of the Soviet advance. While approaching the eastern suburbs of the city, the Red Army temporarily halted combat operations, enabling the Germans to regroup and defeat the Polish resistance and to destroy the city in retaliation. The Uprising was fought for 63 days with little outside support. It was the single largest military effort taken by any European resistance movement during World War II.The Uprising began on 1 August 1944 as part of a nationwide Operation Tempest, launched at the time of the Soviet Lublin–Brest Offensive. The main Polish objectives were to drive the Germans out of Warsaw while helping the Allies defeat Germany. An additional, political goal of the Polish Underground State was to liberate Poland's capital and assert Polish sovereignty before the Soviet-backed Polish Committee of National Liberation could assume control. Other immediate causes included a threat of mass German round-ups of able-bodied Poles for "evacuation"; calls by Radio Moscow's Polish Service for uprising; and an emotional Polish desire for justice and revenge against the enemy after five years of German occupation.Initially, the Poles established control over most of central Warsaw, but the Soviets ignored Polish attempts to make radio contact with them and did not advance beyond the city limits. Intense street fighting between the Germans and Poles continued. By 14 September, the eastern bank of the Vistula River opposite the Polish resistance positions was taken over by the Polish troops fighting under the Soviet command; 1,200 men made it across the river, but they were not reinforced by the Red Army. This, and the lack of air support from the Soviet air base five-minutes flying time away, led to allegations that Joseph Stalin tactically halted his forces to let the operation fail and allow the Polish resistance to be crushed. Arthur Koestler called the Soviet attitude "one of the major infamies of this war which will rank for the future historian on the same ethical level with Lidice." On the other hand, David Glantz argued that the uprising started too early and the Red Army could not realistically have aided it, regardless of Soviet intentions.Winston Churchill pleaded with Stalin and Franklin D. Roosevelt to help Britain's Polish allies, to no avail. Then, without Soviet air clearance, Churchill sent over 200 low-level supply drops by the Royal Air Force, the South African Air Force, and the Polish Air Force under British High Command, in an operation known as the Warsaw Airlift. Later, after gaining Soviet air clearance, the U.S. Army Air Force sent one high-level mass airdrop as part of Operation Frantic, although 80% of these supplies landed in German-controlled territory.Although the exact number of casualties is unknown, it is estimated that about 16,000 members of the Polish resistance were killed and about 6,000 badly wounded. In addition, between 150,000 and 200,000 Polish civilians died, mostly from mass executions. Jews being harboured by Poles were exposed by German house-to-house clearances and mass evictions of entire neighbourhoods. German casualties totalled over 2,000 to 17,000 soldiers killed and missing. During the urban combat, approximately 25% of Warsaw's buildings were destroyed. Following the surrender of Polish forces, German troops systematically levelled another 35% of the city block by block. Together with earlier damage suffered in the 1939 invasion of Poland and the Warsaw Ghetto Uprising in 1943, over 85% of the city was destroyed by January 1945 when the course of the events in the Eastern Front forced the Germans to abandon the city.

Marszałkowska (lit. Marshal Street) is one of the main thoroughfares of Warsaw's city center. It links Bank Square in its north sector with Plac Unii Lubelskiej (Union of Lublin Square) in the south.