The grottos of Frasassi are one of nature’s masterpieces. After centuries and centuries of the effects of the river Sentino, the grottos have been carved in a majestic way with incredible carsic characteristics. The area is equipped and well organized. The grottos are full of concretions and carsic effects, which are great material for the various speleological studies that are carried out in the area. The grottos of Frasassi, in the municipality of Genga, register a high number of annual visitors who are gladly shown around the area with the help of the best guides.