Genga, Marche, Italy
Discovered in 1971, the Frasassi karst cave system is one of Europe's largest & offers guided tours.

Grotte di Frasassi in Genga, Province of Ancona, Marche, Italy, is a spectacular system of limestone caves. Embark on a guided tour to see awe-inspiring stalactites and stalagmites. The Abyss Ancona, one of the world's largest underground chambers, is a highlight. A natural wonder in Italy.
Viale Giovanni Marinelli Parcheggio e Biglietteria Grotte di Frasassi, Località la Cuna, Genga, 60040, IT