We recently told you about some really creepy places in Venice and Transylvania. Your turn to freak us out, Portugal.

The hillside estate of Quinta da Regaleira can be found in Sintra, Portugal, a town that sits smack dab in the middle of a region known for all sorts of kooky stuff, particularly unexplained rock formations and secretive cults. Perhaps oddest of all is a solitary cloud that hangs over the Pena National Palace even on clear days. The locals call it “The Queen’s Fart.

But things were pretty boring up at Quinta da Regaleira until 1892. That’s when a mysterious businessman named Carvalho Monteiro purchased the centuries-old estate. The wealthy Monteiro was a well-known eccentric that loved to collect rare books and was obsessed with world religions. After he got the keys, he quickly purchased all the surrounding property.

Then Monteiro hired Luigi Manini, one of Portugal’s top architects, to redesign both the estate’s villa and the area surrounding it. The architect plopped some creepy gargoyles on top of the house, one of which includes a pretty scary looking bunny rabbit. Inside, he installed a library with mirrors in the floor that create the illusion that its shelves go on forever. Manini and his crew theno spent the following six years turning the surrounding hills into a gorgeous, but incredibly strange, garden filled with references to everything from the Knights Templar to Roman gods along with tons of other weird features. They dug several underground tunnels that led to nowhere and installed one of Portugal’s first aquariums in the far corner of the estate.

Along with grottoes and castle-like observation towers, Manini’s workers also built two wells. But instead of filling “The Initiation Wells” with water, they added ornate staircases. If you’re thinking they might have been used for odd ceremonies, well, you’re correct. Once the finishing touches were in place, Monteiro spent the next several years hosting weird parties at the estate.

Nobody really knows what all Monteiro was up to out there. He passed away in 1920 and Quinta da Regaleira was eventually sold to the city of Sintra in 1997. After some restoration work, officials opened the estate to the public. Almost all of its strange features are still in place and tourists routinely scare themselves silly in the tunnels.