The first ever Etruscan pyramids have been located underneath a wine cellar in the city of Orvieto in central Italy, according to a team of U.S. and Italian archaeologists.

Carved into the rock of the tufa plateau -- a sedimentary area that is a result of volcanic activity -- on which the city stands, the subterranean structures were largely filled. Only the top-most modern layer was visible.

"Within this upper section, which had been modified in modern times and was used as a wine cellar, we noticed a series of ancient stairs carved into the wall. They were clearly of Etruscan construction," David B. George of the Department of Classics at Saint Anselm, told Discovery News....