Image credit: dcabrerizo/Flickr

There is an unusual donation box installed beneath the streets in front of the State Parliament building in Germany’s northern city of Bremen. It appears like a circular, bronze manhole cover, but in the center of the lid, there is a small slit for people to drop coins or paper money. In return, the donation box plays a musical thank you from one of Bremen’s four famous musicians—a donkey, a dog, a cat and a rooster.