Frasassi Caves are underground karst caves that are part of the Gola della Rossa and Frasassi Regional Natural Parks. The opening of the caves of Frasassi took place on September 25, 1971. In 1972, the Municipality of Jenga and the regional administration of Ancona established the Frasassi Consortium in order to maintain and improve the Frasassi complex.
In karst caves you can see natural sculptures formed by layers of limestone for more than 190 million years, thanks to the work of water and rock. Water flowing over limestone dissolves small amounts of it and, for thousands of years, droplets falling on the ground form nodules of considerable size and shape, sometimes very unusual. They are divided into stalagmites (columns growing from bottom to top) and stalactites (hanging from the vaults of caves). The shapes and sizes of these natural masterpieces so amazed the imagination of cavers that every time after meeting them they gave them the most unusual names; Among the most famous stalactites and stalagmites, one should mention the “Giants”, “Camel” and “Dromadera,” “Ursa Major”, “Madonnina”, “Damocles Sword” (stalactite with a height of 7.40 m and a diameter of 150 cm), “Niagara Falls” , “Slice of bacon” and “Slice of bacon”, “Obelisk” (stalagmite 15 m high, Hall 200), “Organ pipes” (conical-lamellar nodules that resonate upon impact), “Castle of the Witches”. Inside the caves there are also small lakes with stagnant water and “wells” - cylindrical cavities up to 25 m deep, in which water is collected or directed lower to the karst layers. The duration of the visit to the cave is 70 minutes. Group visits are accompanied by professional guides from the Frasassi Consortium. The route has a length of 1,500 meters; well equipped and easily accessible. The internal temperature is constant at 14 ° C.