The earliest known record of crop circles is more than 300 years old. Today, more than 10,000 have been recorded around the world. Learn more in Investigating Crop Circles, a World's Greatest Mysteries book.
People have believed in ghosts since ancient times. In 2018, more than half of the people responding to a survey believed they had seen one. Learn more in Investigating Ghosts, a World's Greatest Mysteries book.
People say a building is haunted if they believe it holds ghosts or spirits. More people in the United States believe in haunted houses than in any other paranormal phenomenon. Learn more in Investigating Haunted Houses, a World's Greatest Mysteries book.
Sasquatch is known by many different names, including Bigfoot, Yowie, and Skunk Ape. The earliest known Sasquatch sighting is about 1,200 years old. Learn more in Investigating Sasquatch, a World's Greatest Mysteries book.
Ships and planes have gone missing in the Bermuda Triangle for more than 150 years. Explanations range from aliens to rogue waves. Learn more in Investigating the Bermuda Triangle, a World's Greatest Mysteries book.
In 1971, D.B. Cooper jumped out of an airplane with $200,000 in ransom money. Today, the hijacking is the only unsolved air piracy case in the United States. Learn more in Investigating the D.B. Cooper Hijacking, a World's Greatest Mysteries book.
Any unexplained object that people see in the sky is known as an Unidentified Flying Object, or UFO. Today, one in seven Americans claims to have seen a UFO. Learn more in Investigating UFOs, a World's Greatest Mysteries book.