Imperia

Imperia is a statue at the entrance of the harbour of Konstanz, Germany, commemorating the Council of Constance that took place there between 1414 and 1418. The concrete statue is 9 metres high, weighs 18 tonnes, and stands on a pedestal that rotates around its axis once every three minutes. It was created by Peter Lenk and clandestinely erected in 1993.

Source: Wikipedia