Quinta da Regaleira Gardens and Initiation Well | Sintra, Portugal

This inverted tower – Initiation Wells, is one of the most intriguing parts of the Quinta da Regaleira Gardens. Climbing this tower was much like climbing any other tower, the only difference is that… it is buried underground.

More about this image here: https://sumfinity.com/hdr-photos/portugal/sintra/initiation-well/