Designed by architect Luigi Manini for the eccentric millionaire Antonio Augusto Carvalho Monteiro, this estate is a fever dream of occultism. Monteiro was fascinated by alchemy, Masonry, and the Rosicrucians, leading him to construct a park filled with hidden symbolism. The most striking features are the two Initiation Wells, which are inverted towers dug deep into the earth. These wells were never used for water collection - instead, they served as ritual sites for secret society initiations. A subterranean labyrinth of dark tunnels connects the wells to various grottoes and monuments, symbolizing a journey from darkness to light. Visitors often feel a sense of unease navigating the damp, lightless passages that suddenly open into lush, strange gardens. The architecture blends Gothic, Renaissance, and Manueline styles, creating a dense, overwhelming atmosphere of mystery that remains one of Portugal's most enigmatic landmarks.