It is one of the largest caves in the world, the Grotta gigante: its dimensions are so huge that supposedly even the Dome of the Vatican could be placed in this cavern. It is believed that the cave was populated already in prehistoric times, inhabited until at least at the beginning of the Roman Empire.
The cave was discovered in 1840 by Federico Lindner. 1890 and 1904 further entrances to the cave were discovered, through which one can easily climb into the depths.
Due to the enormous height of the cavern two of the longest measuring pendulums (Foucault style) in the world are located here, where measurements are taken, shielded from atmospheric influences und seismic movements.
April - September
Tuesday - Saturday 10.00 - 16.00 o'clock, 2 times an hour
March and October
10.00 - 16.00 o'clock
Otherwise: 10.00 - 12.00 o'clock
Admission: 11,- €, reduced: 9,- €, children: 8,- €