This stunning mountain lake was named for a pair of tragic lovers whose statues stand at the center.

A fortress built to pacify local uprising that had a stint as a Nazi concentration camp before becoming a five-star hotel.

Remains of a station that only operated for one year.

The spectacular Roshen Fountain show lights up the night sky all summer long, until it "hibernates" under the ice waiting for spring to come.

A quirky collection flush with information on commode culture from ancient times to modern day.

The ruins of an abandoned church loom within a picturesque Ukranian village.

When you've got to go, you've got to go.

The deepest metro station in the world.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

A subterranean Holocaust refuge within one of the world's longest cave systems.

This attraction was abandoned after the Chernobyl disaster.

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

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

This fairytale medieval church in Poland originally spent centuries in Norway.

The coffin-shaped church was once home to monks who slept in coffins.

This imposing 20th-century castle was abandoned before it was ever completed.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

A striking public sculpture representing the period of martial law in Communist Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

Museum dedicated to "the man who moved the Earth."

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.