sintra, portugal - october 9, 2017: stairway of poco iniciatico (initiation well) in quinta da regaleira complex in sintra, portug

underground subterranean sightseeing sight monument initiatory curve unesco ancient landmark tunnel mansion staircase romantic descending portugal sintra well architecture historic history travel quinta regaleira initiation portuguese palace art lisbon old medieval heritage outdoor deep park gothic stone garden moss green stair masonic masonry manueline poco iniciatico