Monster Kabinett: Those incredible corners that Berlin offers.
A surreal underground world is hidden in Mitte. This hidden robotic art gallery, 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 climbing the spiral staircase. The gallery is safe, of course, but it is built to instill as much fear and dread as possible.