This cave has very ancient origins: it is a magnificant tunnel dug out of the tufo by the architect Seiano, the celebrated Minister of Tiberius.
It acts as the entrance way to the complex of Pausyllipon, meaning "rest from toil", a number of imperial Roman villas of the time of Augustus Caesar, built on the highest part of the Posillipo hill.
The cave, a wonderful artificial tunnel, goes right through the Posillipo hill, joining Coroglio to the Valley of Gaiola. Its total length is about 770 metres and is variable in shape, both in width and in height, and with a series of side tunnels to let in light and air.
The gallery was rediscover in May 1840, its having been lost from memory after the 16 century.