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Polantis - The Inverted Tower in Sintra, Portugal. This underground tunnel with a spiral staircase, supported by curved columns, evokes references to Dante's Divine Comedy and may represent the nine circles of
Initiation well or inverted tower in the park of the Quinta da Regaleira palace in Sintra, Portugal Stock Photo - Alamy
Quinta da Regaleira - Wikipedia
The mysterious 'inverted tower' steeped in Templar myth - BBC Reel
Sintra Inverted Towers, Amazing Portugal - I AM Family