Really a unique show that Nature wanted to give us in the Marche region: underground karst caves, which you have never seen before! This system of caves, within the Natural Regional Park of Gola della Rossa and Frasassi, was discovered in 1948. Following the more touristic route you will venture in the Abyss of Ancona, passing through the Crystallized Lake, the Niagara Falls, the Little Fairy’s Castle, the Giants, then go through Hall 200, the Grand Canyon, Ursa’s Hall, and finish in the Neverending Hall.