Depending on how brave you are, this is either a list of 10 places to avoid at all costs, or some inspiration for your next holiday!
1. Trans-Allegheny Lunatic Asylum
This creepy building is a triple threat, because it was an asylum, a Civil War military post, and there's also a cemetery on the grounds. The asylum stayed open until the 1980s, when the building's awful conditions and poor treatment of patients got it shut down for good.
But some old residents are said to roam the halls even now...
2. The Monte Cristo Homestead
Called Australia's most haunted building, the Monte Cristo Homestead was originally owned by the wealthy Crawley family. Through the years, the Crawleys experienced a number of tragedies, including a young boy falling down the stairs, a maid falling off the balcony, and a stable boy dying in a fire.
The new owners seemed to inherit the spirits, because a new caretaker was murdered after the home was sold in 1948.
3. The Ancient Ram Inn
Owned continuously since 1145, the Inn is rumored to be built on a pagan burial ground, and has hosted its fair share of dark rituals.
Guests regularly report being harassed in their bed by spirits, and the owner won't go anywhere in the building without his Bible. Strangely, the scary reputation has actually made the tiny Inn a big success.
4. Saint Augustine Lighthouse
A lighthouse might not seem very scary, but once you're inside you realize how secluded and eerily quiet these buildings are.
The Saint Augustine is also full of restless spirits, including the daughters of the builder - who died during construction.
The old lighthouse keeper, William A. Harn, is rumored to still roam the basement, and a woman can be heard crying for help from the top floor while ghostly footsteps race after her. These spirits appear so regularly that this has been called the "Mona Lisa" of paranormal sites.
5. Cecil Hotel
The real-life inspiration for American Horror Story: Hotel, the Cecil has been host to a long list of disturbing events since the 1920s. Two serial killers called the hotel their home, and there have been a number of mysterious suicides there.
But the most frightening case of all was the disappearance of Elisa Lam, who vanished from the hotel under mysterious circumstances before her body was discovered in the hotel's water tower.
6. The Catacombs of Paris
The remains of more than 6 million people were moved into tunnels beneath the City of Lights in the 18th centuries, when the city's graveyards were overflowing.
Since 1874, thousands of brave tourists have explored the depths, from the Gates of Hell to the terrifying Crypt of the Sepulchral Lamp, and have reported no end of disturbing sights in the darkness.
7. The Banff Springs Hotel
Forget the Overlook, this hotel in Canada is really crawling with ghosts. Some are friendly, like the bellman Sam Macauley, who will carry your bags up to your room.
Others are more mysterious, like the woman in a flaming wedding dress who dances in the ballroom. Room 873 is reportedly so haunted that the hotel won't even rent it out.
8. The Island of Dolls
The local legend says the only man living on this island near Xochimilco, Mexico discovered a a drowned little girl, then hung her doll up in the trees to as a sign of respect for her.
Over the decades, he strung up more and more dolls, until one day the locals found him dead in the same place as the little girl. The rumor is the man was haunted by the little girl's restless spirit, and hung the dolls as a kind of protection.
Whether or not it's true, locals keep the tradition alive by hanging fresh dolls for the spirits to play with, and they insist that you can sometimes hear them whispering.
9. The Amityville Horror
This house on Long Island was never the same after Ronald DeFeo Jr. shot and killed the other six members of his family. The next family to move in, the Lutzes, were frightened out of the home by paranormal activity in less than a month.
Today the spirits seem calm, and the house has been redecorated to disguise its history. "Nothing weird ever happened, except for people coming by because of the book and the movie," the owners said back in 2010.
But it's hard to believe the house has changed for good...
10. The Queen Mary Hotel
This cruise ship set sail in the 1930s, became a warship in the '40s, and was later converted into a hotel. Over the years it has picked up a few ghostly passengers, from sailors and guests to children who drowned in the boat's swimming pool.
The adventurous can still stay overnight on the Queen Mary, but not in room B340. The crew have closed that room for good because of all the disturbing occurrences over the years.