The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

This historic black and white monastery is one of Bulgaria's architectural jewels.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

A sacred lake composed of over 300 separate pools of highly concentrated minerals.

As the Dead Sea continues to deplete, massive sinkholes open along its banks.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

A massive, heart-shaped, wind-carved crater in the middle of the Israeli desert.

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

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

An undulating wicker beast looms peacefully atop a sand dune in Belgium.

Somewhere there is a giant who can no longer poop, but now travelers can stay inside his anus.

A marble Lucifer hides behind the pulpit of this Gothic cathedral.

Sculpture designed by Turkish artist and professor Mehmet Ali Uysal.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Hiding the longest subterranean river known in the world.

One of the deepest indoor swimming pools in the world.

Climb inside an iron crystal magnified 165 billion times its normal size.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

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

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

The Devil’s own choice when he needs a drink in Brussels.

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.