The chasm of Monte Vermicano in Guarcino is one of the most extensive karst caves of Lazio with four entrances (Vermicano, Gresele, Tana degli Eretici - Hideout of the Heretics, and GnomoGnomo - GnomeGnome).
The cave is part of a complex karst system whose explorations began September 10, 1972 but only in 1973, did they manage to reach the bottom.
It is a favourite destination for cavers from all over Italy.
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