The largest of the two initiation wells in Quinta da Regaleira, Sintra, reaches 27 metres (88.5 feet) below the ground and is accessed by a spiral staircase.
Penetrating deep into the bedrock, the stone steps serve several small landings. Damp, mysterious, covered in moss and steeped in mysticism,
the breathtaking architecture of these so-called initiation wells are a must-see for visitors to the region.