A former Confederate hospital serves as a remembrance of wounded and dead soldiers.

Heron, whitewater rapids, and urban industrialism all add to the beauty of this concrete nature walk.

Children's playground hidden under a big pink and blue cap.

A giant Australian fruit and tropical farm.

The once-dying town of Sheffield, Tasmania has reinvented itself as a village of painted wonders.

Dilapidated ruins that once treated a notorious young serial killer, currently hosting vandals, squatters, and ghost hunters.

Australian Lake set aglow by Noctiluca Scintillans.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

France's most famous cemetery, with some of its most curious tombs.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Natural time capsule containing an alien ecosystem.

Famously misunderstood wonder of the ancient world

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

A layered tribute to the work of mosaicist Isaiah Zagar.

These azure waters were thought to lead to the Mayan Underworld.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

An ethereal glowing blue ocean cave in Croatia.

This beautiful natural train tunnel is said to grant the wishes of visiting lovebirds.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

Centuries-old bridges grown from tangled roots.

A gargantuan crystal kingdom.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.