A memorial to the unknown and unheralded men and women of the Cold War military and intelligence services.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

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

An explosion of natural color known as "the river that ran away from paradise."

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

A surviving concrete arrow from a 1920s navigational network is preserved right off a modern freeway.

This is one really big nut.

Edinburgh’s version of the Sistine Chapel is this former church, with an interior covered in paintings done by one woman over the course of nearly a decade.

This chestnut box will not be opened until the country music legend's 100th birthday in 2046.

A once-thriving hotel in the Swiss Alps couldn't compete with climate change.

The childhood home of the legendary blues guitarist and singer.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

Mosaics, storks, and brothels—this ancient city has it all.

An ancient city hidden in the heart of the Sierra Nevada mountains.

Huge stone depressions which may have acted as an Incan agricultural experiment.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

This parking garage was the site of what was - at the time - the largest cash robbery in history.

During World War II, Austria's oldest salt mine was used to store thousands of pieces of stolen artwork.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

During World War II, the Nazis repurposed this beer cellar to store stolen artwork.

Home to a vast collection of The Wizard of Oz memorabilia and the site of an infamous theft.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

Lured here by the promise of tens of thousands in gold, Jesse James started a quintessentially American trend of robbing trains in-motion.

Where Santa Claus held up a Texas bank and started a statewide manhunt.