Your Secret place in Berlin is...

Monster Kabinett:Those incredible corners that Berlin offers.
A surreal underground world is hidden in Mitte. This hidden gallery of robotic art, which has been created and maintained by an art collective known as the Dead Pigeon/Dead Chickens Collective, is an alley full of robotic creatures, metal sculptures, and insect-like beasts assembled as a computer-controlled sound and art installation.

The entrance can be found in the second courtyard of Haus Schwarzenberg by going up the spiral staircase. The gallery is safe, of course, but it is built to instill as much fear and dread as possible.

Also, don't miss this Rooftop...

Klunkerkranich: Neukölln’s rooftop bar is one of Berlin’s most popular spots. With an incredible panoramic view! It is at the top of the Arcade Neukölln shopping center, and from time to time there is live music. If you want to watch the sunset from here, go early to
get a good spot and avoid the line at the entrance.