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Founded about 1200, the Nikolaiviertel (Nicholas' Quarter) of Alt-Berlin, together with nearby Cölln, jointly make up the reconstructed historical heart of the German capital of Berlin. It is located in Mitte locality (in the homonymous district), five minutes away from Alexanderplatz.

The St. Nikolai-Kirche, (Nikolaikirche or St. Nicholas' Church) is the oldest church in Berlin, the capital of Germany. The church is located in the eastern part of central Berlin, the borough of Mitte. The area around the church, bounded by Spandauer Straße, Rathausstraße, the River Spree and Mühlendamm, is known as the Nikolaiviertel 'Nicholas quarter', and is an area of restored medieval buildings (in some cases recent imitations). The church was built between 1220 and 1230, and is thus, along with the Church of Our Lady at Alexanderplatz not far away, the oldest church in Berlin.

The Greater Berlin Act (German: Groß-Berlin-Gesetz), officially Law Regarding the Creation of the New Municipality of Berlin (German: Gesetz über die Bildung einer neuen Stadtgemeinde Berlin), was a law passed by the Prussian state government in 1920, which greatly expanded the size of the Prussian and German capital of Berlin.

The Hemp Museum (German: Hanf Museum Berlin) was opened in Berlin on 6 December 1994. It is the only museum in Germany focused on the cannabis plant. The museum also actively promotes the protection of children and young people and offers individually tailored tours of the exhibition with care staff. It serves as a meeting place for the organisers of the Hanfparade. The Hanf Museum regularly takes part in the "Long Night of Museums", the Berlin Fairytale Days and the Historale which takes place in the Nikolai Quarter. In 2017, the Hanf Museum took part in the Kirchentag in Berlin as a self-organised event on the topic of the war on drugs with speakers from South American victims, including the Reverend Martin Diaz from El Salvador.

The Ephraim Palace (German: Ephraim-Palais) is a Rococo-style building in Berlin, Germany, originally constructed in 1766. Despite the destruction of the palace in 1936 by Nazi Germany, the beginning of a reconstruction was possible in 1985, as many elements of the facade had been stored in East Germany. Today, the Ephraim Palace is a cultural-heritage property and houses a museum, mostly dealing with cultural topics. The Ephraim Palace is named after Veitel Heine Ephraim, who hired the experienced architect Friedrich Wilhelm Dieterichs to design a palace on the property of the oldest pharmacy of Berlin.

The Nathan Israel Department Store (German: Kaufhaus Nathan Israel or Kaufhaus N. Israel) was a department store in Berlin. The business was started in 1815 by Nathan Israel as a small second-hand store in the Molkenmarkt. By 1925, it employed over 2,000 people and was a member of the Berlin Stock Exchange, and in the 1930s was one of the largest retail establishments in Europe. Because it was owned by Jews, the store was boycotted by the German government when the Nazi Party came to power in 1933. It was ransacked during the Kristallnacht in 1938 and then handed over to a non-Jewish family by the Nazis. The descendants of the original owners began to receive compensation for their losses after the fall of the Berlin Wall in 1989.

The Raid on Berlin took place in October 1760 during the Third Silesian War (part of the Seven Years' War) when Austrian and Russian forces occupied the Prussian capital of Berlin for several days. After raising money from the city, and with the approach of further Prussian reinforcements, the occupiers withdrew. There were later allegations that the Russian commander Count Tottleben had received a personal bribe from the Prussians to spare the city, and he was subsequently tried and found guilty of being a spy.

The Rotes Rathaus (German: [ˈʁoːtəs ˈʁaːtˌhaʊs], Red City Hall) is the town hall of Berlin, located in the Mitte district on Rathausstraße near Alexanderplatz. It is the home to the governing mayor and the government (the Senate of Berlin) of the state of Berlin. The name of the landmark building dates from the façade design with red clinker bricks.

Mühlendamm (Mill Dam) is a major thoroughfare in the central Mitte district of Berlin, Germany. It runs from the historic Cölln and Fischerinsel quarters to the Molkenmarkt square of Alt-Berlin via the Mühlendammbrücke (Mill Dam Bridge) crossing the Spree river. Named after several watermills at the site, a historic causeway was first laid out at this location about 1200 and became the nucleus of the late medieval city foundation. The current prestressed concrete bridge was built in 1968. It is part of an east–west road link to Berlin's city centre and the Bundesstraße 1 highway.

Rotes Rathaus is a subway station in Berlin's Mitte district. It is part of the extension of the U5 from Alexanderplatz to Brandenburger Tor, construction of which began with a turf-cutting ceremony in 2010. The station and the line opened simultaneously on 4 December 2020.

Mitte (German pronunciation: [ˈmɪtə] (listen)) (German for "middle" or "center", commonly used without an article) is a central locality (Ortsteil) of Berlin in the eponymous district (Bezirk) of Mitte. Until 2001, it was itself an autonomous district. Mitte comprises the historic center of Alt-Berlin centered on the churches of St. Nicholas and St. Mary, renowned Museum Island, the city hall Rotes Rathaus, the city administrative building Altes Stadthaus, the famous Fernsehturm, Brandenburg Gate at the end of the central boulevard Unter den Linden and more main tourist attractions of the city. For these reasons, Mitte is considered the "heart" of Berlin.

Alt-Berlin ("Old Berlin"), also spelled Altberlin, is a neighborhood (Stadtviertel), situated in the Berliner locality (Ortsteil) of Mitte, part of the homonymous borough. In the 13th century it was the sister town of the old Cölln, located on the northern Spree Island in the Margraviate of Brandenburg. It counts in its territory the zone of Nikolaiviertel.