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Quinta da Regaleira - Sintra, Portugal

This unusual palace was eccentrically designed by Carvalho Monteiro and is a UNESCO World Heritage Site. It contains a palace, gardens, underground tunnels, grottoes, fountains and caves. It was built between 1904 and 1910 and invokes feelings of Roman, Renaissance, Gothic and Manueline architectural styles. What are really fascinating are two initiation wells (pictured) that resemble reversed towers, lined with stairs and going down into the earth, and used for Tarot initiation rites.