Quinta da Regaleira - Sintra
Photos from http://www.regaleira.pt/
Quinta da Regaleira is located in Sintra, it is classified as a World Heritage Site by UNESCO.
There we can see a romantic palace, a luxurious park, lakes, grottoes, benches, fountains, a Roman Catholic Chapel, tunnels, 2 initiatic wells aka inverted towers used for ceremonial purposes, some references said that the wells are in some way linked and inspired with the "The Divine Comedy" from Dante.
Must be visited