This location is an old Cold War listening post based on the top of Devil's Mountain in the Berlin area. It's become a tourist attraction and the owners have turned it into a type of street art mecca. You can do a guided tour or you can just pay to get in and wander at will. It's just under a 2 km hike through the forest to get up to it. There were rumours of wild boars but no sightings for me!
The acoustics at the top of the tallest dome were amazing. I spent a lot of time up there just listening. You could make the slightest movement and hear it amplified so loud. You had to climb several levels of stairs in the pitch dark to get up there. Maybe not the traditional sneak in urban experience but definitely a cool experience and worth a trip if you're in that area. The downside is all the people!
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