It is a 27 metres deep well is located near the historic center of Sintra, Portugal lies the Quinta da Regaleira- a spectacular estate that sits in a World Heritage protected landscape.
It was owned a well know Masons and it was never used to draw water.
It is called the initiation well which was meant to lead one on a journey of self discovery and rebirth.
You are either go into the darkness or coming out into the light also it could be deemed as Death and Birth.