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Photo: ~~, CC BY-SA 4.0 via Wikimedia Commons
Also known as "Picasso und seine Zeit", this not so large, but precious museum hosts a very good collection of paintings and sculptures signed by Picasso, Klee, Matisse, Giacometti, and others from the first decades of the 20th century.
The Berggruen Museum is a collection of modern art classics in Berlin, which the collector and dealer Heinz Berggruen, in a "gesture of reconciliation", sold to his native city far below its market value. The most notable artists on display include Pablo Picasso, Alberto Giacometti, Georges Braque, Paul Klee and Henri Matisse. The Berggruen Collection is part of the National Gallery of Berlin.
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A small but interesting collection of decorative arts from the Art Nouveau and Art Deco periods
A museum dedicated to surrealist art.
Schloss Charlottenburg
One of the oldest buildings in Charlottenburg and actually the reason for the whole city to be built.
inside the Charlottenburg Palace
The green areas of the park are free, so you can go there to have a walk even if you are not interested in the palace. It covers a large area and you can get in from the entrance just near the "New Pavillon" (Neuer Pavillon a.k.a. Schinkelpavillon) placed on the right of Luisenplatz.
Do a boat tour on the Spree River or the Landwehrkanal - many of them start or end at Charlottenburg.
Classic opera house of West Berlin.