Haunting graffiti left by prisoners of the Spanish Inquisition.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.

Two monstrous faces loom over a village in Czechia.

Enormous sandstone towers loom within a Czech forest.

This ancient Irish landscape boasts hundreds of legendary ruins.

Monty Python fans will recognize this abandoned mine as the Cave of the Killer Rabbit of Caerbannog.

An impressive if morbid collection of mummified remains from different eras of the region's history.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

This unique temple complex remains off the typical tourist trail.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

This geometric feat is a testament to the Incas' mesmerizing architectural abilities.

Raging waters have created a strange geological site that looks like something off of a progressive rock album cover.

These strikingly colorful paintings were created by a mysterious Mesoamerican civilization.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

One of the American Southwest's most extensive collections of Navajo rock art.

The northernmost international land border crossing in the United States.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

Its buzzing collection honors vibrator history.

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.