3. Rummu Prison, Estonia
Of all the underwater sites around the world, Estonia’s semi-emerged Rummu Prison might just be the creepiest. The prison was built by the Soviet Union and filled with inmates in the 1940s, where the prisoners were forced to work in the nearby limestone quarry. The jail was abandoned when Estonia gained its independence in 1991, and the lack of supervision caused the quarry to quickly fill up with water. Rummu Prison is now a popular beach, especially among scuba divers who want to explore the submerged buildings and mining equipment below the surface.
4. Pripyat, Ukraine
Pripyat was the city most affected by the Chernobyl nuclear disaster in 1986. The incident released massive amounts of radiation, forcing the residents to flee. The spot is now one of the most well-known abandoned places in the world, thanks in large part to the ghostly reminders of what used to be: toys in a schoolhouse, clocks all frozen at the exact same time, and the famous decaying amusement park. The park has become so famous, in fact, that Ukraine is making it an official tourist attraction.