The Frasassi Caves are a vast underground karst cave system located in the municipality of Genga, in the Marche region of Italy. They are renowned for their enormous size and spectacular formations of stalactites and stalagmites. The accessible tourist trail allows visitors to admire the Abyss of Ancona Hall, one of the largest underground halls in Europe. The surrounding area also offers attractions such as the Hermitage of Santa Maria Infra Saxa and the Valadier Temple, which enrich the cultural and natural experience of the excursion. The visit is a deep immersion into the geology and natural history of the region.