Quinta da Regaleira is a quinta located near the historic centre of Sintra, Portugal. It is classified as a World Heritage Site by UNESCO within the "Cultural Landscape of Sintra".
Check out this tour:
https://www.viator.com/tours/Lisbon/Sintra-Regaleira-and-Pena-Palace-tickets-included-from-Lisbon/d538-43728P20?pid=P00012552&uid=U00356192&mcid=58086
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