Karlsplatz station (Vienna U-Bahn)

The Opernpassage (Opera passage) in the Inner City of Vienna is a Grade II listed pedestrian underpass under the ring road (Ringstraße). It was opened in 1955, a day before the re-opening of the nearby Vienna State Opera.Designed by architect Adolf Hoch it has been a symbol of a modern spirit in architecture and urban planning. After more than 50 years the City of Vienna undertook a complete restoration of the structure, advised by the Federal Office for the Protection of Monuments in Austria. The passage was reopened on 17 September 2013. It shows the original design of the round columns, the curved glass of the shop windows, and the chequerboard pattern of the floor.The artwork Pi by Canadian artist Ken Lum is installed on the walls of the western branch of the pedestrian passage since 2006.

Karlsplatz Stadtbahn Station is a former station of the Viennese Stadtbahn. The buildings above ground on Karlsplatz are a well-known example of Jugendstil architecture. These buildings were included in The Vienna Secession, as they followed many of the artistic styles of that movement. They were designed by Otto Wagner, adviser to the Transport Commission in Vienna, and Joseph Maria Olbrich and are, unlike the other Stadtbahn stations, made of a steel framework with marble slabs mounted on the exterior. These stations allowed Otto Wagner to achieve his goal of creating two modern axes of architecture in a city that was becoming one of the most modern cities of its time.[1] These buildings went on to become the most modern monument of the modern city.[2] Architectural critic and poet Friedrich Achleitner commented on the Stadtbahn stations as follows "...In these two station buildings Wagner reached a highpoint of his dialectic (in his planning of the Stadtbahn) between function and poetry, construction and decoration, whereby a severe rationalism engages in competition with an almost Secessionist kind of decoration." [3]The station was opened as Academiestraße in 1899 (1899). When the Stadtbahn line was converted to U-Bahn in 1981, the original station was scheduled to be demolished. As a result of public outcry, it was decided to keep the station buildings. Both buildings were disassembled, renovated, and then reassembled two metres (6 ft 7 in) higher than their original location after completion of U-Bahn construction. One of the buildings is now used as an exhibition space by the Vienna Museum, with an U-Bahn entrance in its rear; the other is used as a café.

Café Museum is a traditional Viennese café located in the Innere Stadt first district in Vienna. The café opened in 1899. The original interior was designed by renowned architect Adolf Loos. The café became a meeting place for Viennese artists.

The Andorran Permanent representative to the United Nations Office at Vienna has his residence in Andorra La Vella and is also accredited as Ambassador to the governments in Vienna (Austria), San Marino, Prague (Czech Republic), Bratislava (Slovakia), Bucharest (Romania) Budapest (Hungary) and is head of delegation of the Principality of Andorra next to the Organization for Security and Co-operation in Europe and representative of Andorra to the Preparatory Commission of the Comprehensive Nuclear-Test-Ban Treaty Organization.

Palais Königswarter is a Ringstraßenpalais in Vienna, Austria. It was built for the aristocratic Königswarter family.

Karlsplatz (German for 'Charles Square') is a town square on the border of the first and fourth districts of Vienna. It is one of the most frequented and best connected transportation hubs in Vienna. The Karlskirche is located here. The first district can be reached either by subway (Karlsplatz station) or via Operngasse (a street). The pavilions of the former Karlsplatz Stadtbahn Station remain despite the construction of the U-Bahn system.

The Alban Berg Monument, in Vienna, Austria, is a memorial to the composer Alban Berg (1885–1935), unveiled in 2016. It is situated on Herbert-von-Karajan-Platz next to Vienna State Opera.

TU Wien (German: Technische Universität Wien), also known as the Vienna University of Technology, is a public research university in Vienna, Austria.The university's teaching and research is focused on engineering, computer science, and natural sciences. It currently has about 28,100 students (29% women), eight faculties and about 5,000 staff members (3,800 academics).

Pi is the name of a multimedia installation in the vicinity of the Viennese Karlsplatz. Pi is located in the Opernpassage between the entrance to the subway and the subway stop in Secession near the Naschmarkt. The individual behind the project was the Canadian artist Ken Lum from Vancouver.Pi, under construction from January 2005 to November 2006 and opened in December 2006, consists of statistical information and a representation of π to 478 decimal places. A more recent project is the calculation of the decimal places of π, indicating the importance of the eponymous media for installation of their number and infinity. The exhibit is 130 meters long. In addition to the number pi, there is a total of 16 factoids of reflective display cases that convey a variety of statistical data in real time. Apart from the World population there are also topics such as the worldwide number of malnourished children and the growth of Sahara since the beginning of the year. Even less serious issues such as the number of eaten Wiener Schnitzels in Vienna of the given year and the current number of lovers in Vienna are represented. In the middle of the passage standing there is a glass case with images, texts and books on the subjects of population and migration. The scientific data were developed jointly by Ken Lum and the SORA Institute. "Pi" is to show that contemporary art is in a position to connect art to science, architecture and sociology. The aim of this project was to transform the Karlsplatz into a "vibrant place to meet, with communicative artistic brilliance."

The First Austrian Republic (German: Erste Österreichische Republik), officially the Republic of Austria, was created after the signing of the Treaty of Saint-Germain-en-Laye on 10 September 1919—the settlement after the end of World War I which ended the Habsburg rump state of Republic of German-Austria—and ended with the establishment of the Austrofascist Federal State of Austria based upon a dictatorship of Engelbert Dollfuss and the Fatherland's Front in 1934. The Republic's constitution was enacted on 1 October 1920 and amended on 7 December 1929. The republican period was increasingly marked by violent strife between those with left-wing and right-wing views, leading to the July Revolt of 1927 and the Austrian Civil War of 1934.

Vienna ( (listen) vee-EN-ə; German: Wien [viːn] (listen); Austro-Bavarian: Wean [veɐ̯n]) is the capital, largest city, and one of nine states of Austria. Vienna is Austria's most populous city and its primate city, with about two million inhabitants (2.9 million within the metropolitan area, nearly one third of the country's population), and its cultural, economic, and political center. It is the 5th-largest city proper by population in the European Union and the largest of all cities on the Danube river. Until the beginning of the 20th century, Vienna was the largest German-speaking city in the world, and before the splitting of the Austro-Hungarian Empire in World War I, the city had two million inhabitants. Today, it is the second-largest German-speaking city after Berlin. Vienna is host to many major international organizations, including the United Nations, OPEC and the OSCE. The city is located in the eastern part of Austria and is close to the borders of the Czech Republic, Slovakia and Hungary. These regions work together in a European Centrope border region. Along with nearby Bratislava, Vienna forms a metropolitan region with 3 million inhabitants. In 2001, the city center was designated a UNESCO World Heritage Site. In July 2017 it was moved to the list of World Heritage in Danger.Additionally, Vienna is known as the "City of Music" due to its musical legacy, as many famous classical musicians such as Beethoven and Mozart called Vienna home. Vienna is also said to be the "City of Dreams" because it was home to the world's first psychoanalyst, Sigmund Freud. Vienna's ancestral roots lie in early Celtic and Roman settlements that transformed into a Medieval and Baroque city. It is well known for having played a pivotal role as a leading European music center, from the age of Viennese Classicism through the early part of the 20th century. The historic center of Vienna is rich in architectural ensembles, including Baroque palaces and gardens, and the late-19th-century Ringstraße lined with grand buildings, monuments and parks.

Palais Gomperz is a Ringstraßenpalais in Vienna, Austria. It was built for the aristocratic Gomperz family.