This angular Dwarven tunnel cuts through a mountainside in Glacier National Park.

"We gonna rock down to Electric Avenue, and then we'll take it higher..."

The best-preserved ancient theater in the world.

The sinister ruins of one of the worst dam failures of the 20th century lie in this astonishing alpine setting.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

An out-of-place grove of sequoias thrives in northern Spain.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

This picturesque island graveyard is the final resting place of dozens of notorious pirates.

One of the most influential presidents in U.S. history wanted only this plain, elegant monument as his lasting memorial.

This headstone-like marker inscribed with three words has been an utter mystery for over a century.

A memorial to a shareholder activist feared by CEOs around the United States.

The only thing stranger than stumbling onto these philosophical musings is the story of the homesteader who created them.

This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

The abandoned mine where American troops discovered a treasure trove of art and artifacts hidden by the Nazis.

This charming, hidden guild museum holds some 700 years of crossbow history.

Once where royalty entertained guests, this opulent table is now one of the longest in the world.

The concrete skeletons of an abandoned Swedish town hide among the trees.

Because sometimes the most efficient route from A to B isn't a straight line.

A homemade anatomical collection of medical anomalies and accidental catastrophes.

At a Bangkok bistro, one pot of beef stew has been cooking non-stop for more than 45 years.

Eight naturally mummified bodies in glass coffins are housed in an underground crypt.

When waves crash onto this section of beach, the rocks sing a song.

The final resting place of the camel who served with the Confederate Army during the Civil War.

A display of torture devices used in the Spanish Inquisition and other scourges of medieval Europe.