On Mount Hymettus or Ymittos, a few kilometers from the center of Athens, there are 3 caves, very close to each other.
The most interesting of these 3 caves is the Cave of the Nimfolepto, of Argedimus, of Pan or of the Muses. It is an underground temple, carved by Argedimus of Thera (today, Santorini) in the fourth century BC.
It is thought that it may have been the place that inspired Plato for the allegory of the cave.