Enjoy Orvieto, in southwestern Umbria, situated on the flat summit of a large butte of volcanic tuff. Orvieto Cathedral is a large 14th-century Roman Catholic cathedral dedicated to the Assumption of the Virgin Mary and it is striped in white travertine and greenish-black basalt in narrow bands, similar in many ways to the cathedral of Siena and other central Italian cathedrals of that era. The city of Orvieto has long kept the secret of its labyrinth of caves and tunnels that lie beneath the surface.This underground city boasts more than 1200 tunnels, galleries, wells, stairs, quarries, cellars, unexpected passageways, cisterns, superimposed rooms with numerous small square niches for pigeon roosts, detailing its creation over the centuries