Quinta da Regaleira is a historic estate located in Sintra, Portugal, about 30 minutes from Lisbon. Built in the early 20th century, the 4-hectare estate was the result of the owner's mystical dreams and designed by architect Luigi Manini. The architecture incorporates Roman, Gothic, Renaissance, and Manueline styles. The grounds include a palace, ornate gardens, lakes, grottoes, and buildings believed to contain symbols related to subjects like alchemy, mythology, and astrology.