The sixteen ton world clock was opened to the public in 1969, shortly before the twentieth anniversary of the German Democratic Republic, along with the Berlin TV Tower(seen in the background). The erection of the clock was part of a larger plan to expand and reorganize Alexanderplatz as a whole. At the end of the renovations, the public square was four times larger than it was at the end of the World War II.
It was intended to be both a symbol of Communist power and of Berlin. It remains the latter today, as it is easily visible throughout the central and some suburban districts of Berlin. With its height of 368 metres (including antenna) it is the tallest structure in Germany, and the second-tallest structure in the European Union.
Checked into Bebelplatz
The Bebelplatz is known as the site of one of the infamous Nazi book burning ceremonies held in the evening of 10 May 1933 in many German university cities. Today a memorial consisting of a glass plate set into the cobbles, giving a view of empty bookcases (large enough to hold the total of the 20,000 burnt books), commemorates the book burning. Furthermore, a line of Heinrich Heine from his play, Almansor (1821), is engraved on a plaque inset in the square: “Das war ein Vorspiel nur, dort wo man Bücher verbrennt, verbrennt man am Ende auch Menschen.” (in English: “That was only a prelude; where they burn books, they will in the end also burn people”).
Checked into Gendarmenmarkt

Gendarmenmarkt is a square in Berlin and the site of an architectural ensemble including the Konzerthaus (concert hall) and the French and German Churches. During World War II, most of the buildings were badly damaged or destroyed. Today all of them have been restored. The German Church was completely destroyed by fire in 1945, during World War II. After German reunification it was rebuilt, finished in 1993 and re-opened in 1996 as a museum of German history. The Konzerthaus Berlin is the most recent building on the Gendarmenmarkt. It was built by Karl Friedrich Schinkel in 1821 as the Schauspielhaus. Like the other buildings on the square, it was also badly damaged during World War II. The reconstruction, finished in 1984, turned the theatre into a concert hall. Today, it is the home of the Konzerthausorchester Berlin.
Checked into Bundesministerium der Finanzen | Detlev-Rohwedder-Haus

The Detlev-Rohwedder-Haus (Detlev Rohwedder House) is a building in Berlin that at the time of its construction was the largest office building in Europe. It was constructed between February 1935 and August 1936 to house the German Ministry of Aviation. The Air Ministry building was one of the few Nazi public buildings in central Berlin to escape serious damage during the Allied bombing offensive in 1944-45.
With its seven stories and total floor area of 112,000 square metres (1,210,000 sq ft), 2,800 rooms, 7 kilometres (4.3 mi) of corridors, over 4,000 windows, 17 stairways, and with the stone coming from no fewer than 50 quarries, the vast building served the growing bureaucracy of the Luftwaffe, plus Germany’s civil aviation authority which was also located there. Yet it took only 18 months to build, the army of labourers working double shifts and Sundays.
Checked into Memorial to the Murdered Jews of Europe (Denkmal für die ermordeten Juden Europas)
The Memorial to the Murdered Jews of Europe is a memorial in Berlin to the Jewish victims of the Holocaust, designed by architect Peter Eisenman and engineer Buro Happold. It consists of a 19,000-square-metre (200,000 sq ft) site covered with 2,711 concrete slabs or “stelae”, arranged in a grid pattern on a sloping field. The stelae are 2.38 metres (7 ft 10 in) long, 0.95 metres (3 ft 1 in) wide and vary in height from 0.2 to 4.7 metres (7.9 in to 15 ft 5.0 in). They are organized in rows, 54 of them going north–south, and 87 heading east–west at right angles but set slightly askew.