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near San Carlo, Toscana (Italia)
Beautiful path with breathtaking views!
The climb to get to the hole I found it quite demanding and a bit dangerous.
Its safier with propper hikking shoes.
Buca del Serpente its a really scary holle about 100 meter deep in the ground.
There is a tax to visit inside the Rocca San Silvestro, but there is a really nice panorama aside from witch is free.