29. Chernobyl’s Exclusion Zone, Ukraine

Unless you're looking for radiation exposure, we would say that Chernobyl is not a place you would want to visit anyway. In 1986 after the Chernobyl nuclear disaster sent radioactive clouds into the air, evacuations began, but it was too late. The damage spread to an 18-mile radius turning the surrounding area into a ghost town. 

Thirty-four years after the disaster, Chernobyl is still off-limits due to the high levels of radiation. Some people can get special permission, but it is tough and probably better that you don't expose yourself to the harmful air.