This unique sculpture is often overlooked by pedestrians.

Built by Maharaja Ranjit Singh, this location was used as a resting place for his troops.

On the outskirts of the small village, an abandoned grassy field glitters thanks to the white stones of an ancient structure.

For decades, vendors have sold clothes once worn by American soldiers who stormed Italy in the 1940s.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

Natural time capsule containing an alien ecosystem.

A late-night restaurant empire was launched from this humble storefront.

A perfect circle of twenty-four mysterious holes dates back to prehistoric time.

Over a thousand feet beneath the Detroit streets is a subterranean metropolis few are allowed to enter.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

This magnificent Japanese garden provides a moment of Zen in rural Vermont.

This historic complex is home to the oldest Christian grave in Kolkata, India.

A grove of "candelabra redwoods" deep in California's Lost Coast.

This extraordinary geological oddity resembles human-made pavement.

In Mexico, an abandoned Scottish-looking castle stands as a tribute to love.

A spiritual sanctuary in a natural cave.

This medieval "painted village" is famous for its geometric facades.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

The only place where can you share a seat with the bums of the Fab Four.

This 15-foot tall obelisk commemorating the Philadelphia-Baltimore railroad connection sat neglected for over a century.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

No one knows how this Pacific Northwest spruce tree came to have so many trunks.

One of the steepest streets in the United States makes an intriguing challenge for cyclists.