4. The Initiation Wells, Sintra, Portugal
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Located in the enchanting town of Sintra, the Quinta de Regaleira estate is famous for its dark and mysterious Initiation Wells. These spiral wells symbolize death and rebirth, offering visitors a glimpse into a secretive, symbolic world. The design of the wells follows the nine circles of Hell and Paradise, making it a must-see for anyone interested in history, mysticism, and architecture.