Hole of Bremen
Underground collection box. When a coin is added, you hear one of the Bremen Town Musicians thanking you. The money goes to the Wilhelm Kaisen charity.
The sounds of a crowing cock, a cat's miaow, a barking dog and the loud hee-haw of a donkey can be heard to emanate from the pavement right in front of the State Parliament on the market square.
This 'song' of the Bremen Town Musicians is the reward for anyone who throws a coin into the hole, which contains a rather unusual donation box. The money goes to the Wilhelm Kaisen charity, which uses it to support a range of projects for local people.
So what are you waiting for, get some change and make the Town Musicians sing!