On top of the Park Inn, a small open-air terrace offers a simple way to see Berlin from above. The spot is open to the public: ride the elevator to the 40th floor and follow the signs up the final stairs. An attendant manages entry and also serves beer and coffee.
Views stretch across Alexanderplatz, with the Fernsehturm standing front and center. The vantage point is close enough to take in the tower’s details and wide enough to watch the city spread out in every direction.
Entry is handled on-site; payment is made directly to the attendant. In summer, an organized base jump experience with Jochen Schweizer is sometimes offered from the roof, adding a dramatic sideline to the usual skyline viewing.
Access depends on weather. The terrace often closes in strong wind or poor conditions, and a notice near the elevator typically confirms whether it is open or closed. On clear days, the experience is straightforward: elevator up, stairs to the terrace, and a quiet perch above the city.
Source - https://en.wikipedia.org/wiki/Park_Inn_by_Radisson_Berlin_Alexanderplatz
Places with markets on Wednesdays and Saturdays are popular with locals at Winterfeldplatz. Buy a coffee and browse amongst the stalls; this is a place to unearth hidden gems. Breakfast is served usually until 14:00-15:00.
More than 30 million objects in the scientific collection and a fascinating exhibition in one of the most significant institutions of its kind in the world. Some parts still under construction.
The Bierpinsel ("beer brush") is a building in Steglitz which resembles an observation tower and is famous for its pop-art appearance. The futuristic, landmarked building was built from 1972 to 1976 and has since been used as restaurant, night club, bar, radio station and art café.
The city's Protestant cathedral and the burial place of the Prussian kings. You can climb to the top and get a view of the city.
A remarkable medium-sized classical castle by the famous K.F. Schinkel built 1820 to 1824, also called "Humboldtschlösschen", because Alexander and Wilhelm von Humboldt (and their family) lived here once. Still privately owned.
At a former Luftwaffe and Royal Air Force (RAF) airfield, RAF Gatow. The museum's focus is on military history, particularly the history of the Luftwaffe of the Bundeswehr, with a collection of more than 200,000 items, including 155 aeroplanes, 5,000 uniforms and 30,000 books. There are also displays (including aeroplanes) on the history of the airfield when it was used by the RAF. Aircraft include reproductions of Otto Lilienthal's gliders, of World War I planes such as the Fokker E.III, and World War II planes such as the Bf 109 and Me-262, as well as at least one aircraft of every type ever to serve in the air forces of East and West Germany. Most of those postwar aircraft are stored outside on the tarmac and runways, however, and many are in bad condition. There are long term restoration projects, including a Focke-Wulf Fw 190. RAF Gatow is notable as the "missing third airport" of West Berlin. Each sector used to have its own airport; the French sector had Tegel, the American sector had Tempelhof and the British had Gatow. However, RAF Gatow never saw much traffic of any kind, was more kept as a political statement than for transportation value, and thus was shut down after reunification. Tempelhof, after having been shut down for civilian traffic from 1975 to 1981, closed for all flights in 2008, while Tegel shut down in November 2020.
Oderberger Straße is known for its beautiful and generous Gründerzeit architecture, as well as its cafés and restaurants. Since before Germany's reunification the street has been the desired place for alternative folks and avant-gardists, but the area has seen continual gentrification since the early 2000s.
Not far away from Schloss Tegel (at the "große Malche") you can take a look at the oldest tree in Berlin, an oak which has been growing there since about 1192 (so it's actually older than Berlin itself). The name ("fat Mary") allegedly stems from the brother Humboldt who named the tree after their overweight cook.
The area to the north of Tiergarten, along the bow of the river Spree (Spreebogen), is home to the German federal institutions such as the parliament (Bundestag, in the historic Reichstag building) and the federal government, as well as the new central train station (Hauptbahnhof) across the river.
This chapel was built on the site of a church built in 1894 which sat on the "death strip" and was thus blown up by the GDR authorities in 1985. The chapel is the site of occasional memorial services for victims of the wall.
Museum of Contemporary Art located in former Hamburger Bahnhof train station. Big halls filled with artworks made since 1960s. In 2004 Rieckhallen, former Lehrter Bahnhof, was opened and now provides exhibition space for the Friedrich Christian Flick Collection. Free public guided tours (in English): Sa and Su at 12:00.
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 complex consists of eight interconnected courtyards. Plenty of designer boutiques can be found here.