Your secret place in Berlin is...

Monster Kabinett:Those amazing nooks and crannies Berlin has to offer.
A surreal subway 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 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: The rooftop bar in Neukölln is one of the most popular places in Berlin - with an amazing panoramic view! It's on top of the Arcade Neukölln shopping center, and occasionally with live music. If you want to see the sunset from here, go early to
to get a good spot and avoid the queue at the entrance.