This fantastical waterfall is hidden in a cave located in a cracked cliff.

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

Tubing through a cave lit with glowworms is a magical underground experience.

The beautiful baroque library of the Hapsburg empire.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

Abandoned railway line circling the city of Paris.

Carved by a waterfall in a hard-to-reach rock formation, this heart-shaped rock has inspired romantics for decades.

The most alien-looking place on Earth.

The oldest stone house in Paris was built by its most famous alchemist.

Every autumn, this hillside is ablaze with red summer cypress.

Natural time capsule containing an alien ecosystem.

A submerged archeological park still holds the wonders of a Roman Sodom.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

One man's homage to the sun continues to grow like a glass fractal.

Hellam Township is reputed to feature seven remote gates, which when passed through in the right order, open an entrance to hell.

An alchemist's "magic door" stands in the middle of a Roman park.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

An ethereal glowing blue ocean cave in Croatia.

Elevated freight railway turned wildly successful urban park.

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

A gargantuan crystal kingdom.