These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

One of the most poignant ruins of the Chernobyl nuclear disaster, the local football team's stadium has been quickly reclaimed by nature.

This derelict superstructure was a very important warning system for the Soviet military.

This attraction was abandoned after the Chernobyl disaster.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

France's most famous cemetery, with some of its most curious tombs.

Abandoned railway line circling the city of Paris.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

An abused and forgotten metropolis, abandoned for centuries.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

Roman ruins top white travertine terraces formed by ancient hot springs.

Luxury hotel turned into a refugee camp, then turned back into a luxury hotel.

These Stalin-era industrial 'death traps' hang lifeless above the city

These molds for fiberglass statues have formed an eerie, accidental sculpture park.