Quinta da Regaleira is an estate located near the historic center of Sintra Portugal.It is classified as a World Heritage Site by UNESCO within the "Cultural Landscape of Sintra". Along with other palaces in this area ,it is one of the principal tourist attractions of Sintra. It consists of a romantic palace and chapel and a luxurious park featuring lakes, grottoes, wells, benches, fountains, and a vast array of exquisite constructions. The palace is also known as "Palace of Monteiro the Millionaire", from the nickname of its first owner, António Augusto Carvalho Monteiro.
[Wiki]
