Etruscan Well

The Etruscan Well, also known as "Sorbello well" from the name of the noble family which still owns the mansion which includes the structure, is located in the old town of Perugia. Entrance to the well, currently open to the public as a museum, is from no. 18 piazza Danti, through a covered walkway which leads to the underground sections of Palazzo Sorbello.

Source: Wikipedia