quinta da regaleira, sintra, portugal

greenhouse portugal travel sintra landmarks quinta regaleira glazes surfaces long format glass pavillion hanging pots transparent thermal regulation metal naturalist natural history society plants collection flora stonewalled mystical associations world heritage site tourist attractions romantic palace luxurious park monteiro luigi manini luxuriant vegetation greenery enigmatic alchemy masonry knights templar rosicrucians editorial aug 8th 2024: one principal sintra stone-walled