The Heidelberg Bridge Monkey dates back to the 15th century. It was a stone statue sitting in the tower of the Old Bridge, which was located opposite Heidelberg’s Old Town. The purpose of the tower was to instill fear and respect in anyone arriving in the town, while the monkey represented mockery. The statue was destroyed with the tower during the Nine Years' War.
Touching his bare backside, the monkey showed the Electoral Palatinate Greeting to passers-by. His backside was pointed towards the town of Mainz, which was situated opposite the river bank, and thus, the greeting was addressed to the Bishops of Mainz. The people of Heidelberg wanted to demonstrate that the Bishops in Mainz held no power over the Electors of the Palatinate. The intention of the mirror in the monkey’s hand was to encourage people to engage in critical self-reflection.
Wikipedia https://en.wikipedia.org/wiki/Heidelberg_Bridge_Monkey
Address 1 Am Brückentor, Heidelberg 69117, Germany
Coordinates 49°24'47.944" N 8°42'34.052" E