Sintra, Portugal - : The Initiation well of Quinta da Regaleira in Sintra, Portugal. It's a 27 meter staircase that leads straight down unde

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Sintra, Portugal - : The Initiation well of Quinta da Regaleira in Sintra, Portugal. It's a 27 meter staircase that leads straight down underground and connects with other tunnels via underground

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Photo credit: © Ylan / Alamy / Afripics
License: Royalty Free
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