This place is a quick train ride outside of Lisbon, but well worth it. The town of Sintra is truly beautiful. Quinta da Regaleira is distinct from the rest of the architecture in the area- in fact, the place is insane. The lavishness and obsessive attention to detail is overwhelming. My favorite room is the library (photo above)- the design of the mirror in the floor provides one of the best optical illusions I’ve ever seen.
Website: Portugal Tourist Website