[nicbou]

I live in Berlin too, and I do that a lot. I put my phone in my pocket, take random directions until I get loss, then slowly find my way back. I discovered a lot of things that way, and learned to orient myself in the city. I also saw lots of nice little gems that go unnoticed if you are not paying attention.

A useful one for Berlin: trains usually drive on the right, so you know which way a station is by looking at the train signs.