Frasassi Caves
The 31st longest cave in the world
5km · Length
The Frasassi Caves (Italian: Grotte di Frasassi) are a karst cave system in the municipality of Genga, Italy, in the province of Ancona, Marche. They are among the most famous show caves in Italy.
Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).