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