Quinta da Regaleira is a UNESCO world heritage listed estate near Sintra Portugal. The estate features a palace, a chapel, a lake, grottoes and fountains, and was once home to millionaire entomologist, Antonio Augusto Carvalho Monteiro.
There are two wells on the property, that have spiral staircases lining their walls. The wells were never used as an actual water source, instead they were used for ceremonial purposes, such as Tarot initiation rites. The design of the tunnels themselves connect to Tarot mysticism, with the number of stairs and landings all being symbolic to tarot. Tunnels connect the two wells, and also lead to various monuments and caves around the property.