Arco Etrusco

After the 6th century BC, when Perugia became one of the twelve cities of the Etruscan league, the town was fortified by massive town walls in travertine blocks that are still largely visible today. Seven gates, of which six still exist although partially modified by the Romans and in the Middle Ages, allowed access into town. The Arco Etrusco (Etruscan Arch), also known as Arco di Augusto, located towards north, is the main gate of the Etruscan Town Walls, and one of the oldest monuments of Perugia. Built in the 3rd century BC, its imposing structure is characterized by trapeze-shaped dungeons on either side.

For more information please visit:
https://www.perugiaonline.com/perugia_arcoetrusco.html
https://www.bellaumbria.net/Perugia/arco_etrusco_eng.htm
https://it.wikipedia.org/wiki/Arco_Etrusco