While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

An island filled with hundreds of hanging, decomposing, decapitated dolls.

This giant boulder is pinched over a 1000-meter abyss by two mountains.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

This Croatian island is for sale but no one is buying due to the dozens of accused Nazi sympathizers who were massacred there after WWII.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

After the famous composer died in Paris, his sister snuck his heart out of the country to honor his wish that it be buried in their native country.

This Peruvian canyon is filled with geometric salt pools that have been being harvested since the Incan empire.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

It's always summer at the beach inside this former airship hangar.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

A mouldering Colombian bull ring stands as a reminder of the country's complicated relationship with a brutal sport.

This elegant Colombian fortress was one of the torture headquarters for the Spanish Inquisition.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

The mysterious "Candelabra of the Andes" could represent anything from a god's trident to a hallucinogenic plant.

This replica Viking village was created for a film that was never shot and is now open to visitors.

This odd Chilean waterfall-cano hotel must be entered via a rope bridge.

The attic of a four-century-old canal house hides a clandestine church.

A fascinating insight into daily life in the Eastern Bloc.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

Iceland's "Smoky Valley" is a beautiful river that is shrouded in a constant cover of steam clouds.