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Photo: Andreas Steinhoff, Attribution via Wikimedia Commons
The town hall of Berlin is known as such because it is made of red brick, not due to its former political persuasion. There are nice Prussian rooms inside, which are worth a look.
The Red Town Hall is the town hall of Berlin, Germany, located in the Mitte district on Rathausstraße near Alexanderplatz. It is the seat to the Governing Mayor of Berlin and the government of the state of the city.
© OpenStreetMap contributors
A bronze fountain by Reinhold Begas. It was erected in 1891 as a present from the city of Berlin to the Kaiser. Neptune, trident in hand, presides over the square supported by sea-nymphs with webbed feet carrying him on a seashell. Denizens of the deep (a seal, an alligator, snakes and turtles, among others) spray water at him in homage while languishing mermaids pour water into the fountain, clutching sea-nets overflowing with marine bounty.
St. Nicholas Church
Berlin's oldest church (1230) is a 3-nave hall church. It is in the centre of an area destroyed by bombs in the war which was then turned into a faux "old town" by the East German authorities called Nikolaiviertel. The area is more a hodge-podge of relocated buildings than an authentic reproduction, and the newly-built 1988 apartments that attempt to "harmonize" with the older buildings are embarrassing. The church is one of the only structures that was renovated rather than rebuilt. It is best known for a sandstone sculpture called the Spandauer Madonna (1290), but there are other interesting pieces here. When the church was destroyed in 1938 and rebuilt in the 1970s, the communist officials intended to use it as a museum, which did not open until 1987. The museum includes sacred textiles and religious sculpture from the fourteenth to the sixteenth centuries. The Nikolaikirche is the showplace of the Nikolaiviertel, which isn't saying much.
St. Mary's Church
Gothic church, the second oldest (built in late 13th century) of the historical centre of Berlin. It's the highest church tower of Berlin (about 90 m), but seems rather small beneath the gigantic TV tower. The church tower was built in the late 18th century by Carl Gotthard Langhans, the architect of the Brandenburg Gate.
Hemp Museum
It is the only hemp museum in Germany; you can see the history of hemp, the culture and use of it. You can see hemp grow. There is a cafe downstairs, with an open WiFi access. Everything going on here is legal - including the hemp growing under artificial light (a low THC strain grown with a special permit) - but they do not refrain from political commentary on the legal situation of cannabis in their exhibits.
Television tower
At 368 metres, the Fernsehturm is Berlin's tallest and indeed EU's second-tallest building, complected between 1965 and 1969. The main function of the building is television broadcasting, but the shiny sphere atop the tower houses a viewing platform, a restaurant and a Berlin Tourist Information point. The viewing platform sits 203 metres above ground, affording views of as much as 42 km away and featuring a bar. Given how flat Berlin is, it's not a very interesting view however and the state of the glass means that you can't get good photos either. The Sphere restaurant at 207 metres rotates at a speed of one full spin per 30 minutes. There are two lifts from the base to the platform and cafe, taking 40 seconds to reach the top, as well as a 986-step staircase. The Fernsehturm is not accessible to wheelchair users.
Not all of the Berliners liked the tower and the overall composition of the Alexanderplatz afforded by the socialist city planners. East German T.V. tried to establish the nickname "Telespargel" ("television asparagus") which however doesn't seem to have caught on. During certain times of day, sunlight reflecting from the top caused a large cross-shaped light to shine down on the city. Called the Rache des Papstes (Pope's revenge) by nominally atheist East Berliners, the light-cross was an ironic result of socialist architecture. Rumour has it the architect was deprived of more than his next commission after that fiasco. At night, the Fernsehturm sometimes appears to be shooting light beams from the tower section, giving the impression it's a Death Star à la Star Wars.
A museum in Nikolaiviertel dedicated to the Berliner artist Heinrich Zille.