This mesmerizing medieval monastery-cave complex sits thousands of feet above ground overlooking a valley.

More gold than anywhere else, ever.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

This scenic fortress dates back at least 2,400 years to the time of Magna Graecia.

Legends of treasure and spirits flow from this this fairy tale-like oasis.

The eerie remnants of an ancient forest were hidden under the sand for centuries.

This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

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

Nature took her revenge on the "Wickedest City in the World."

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

This domed temple was built in a hidden cave mouth as a refuge for sinners seeking absolution.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

This quaint Italian town keeps losing ground as the sides of its plateau slowly erode.

An otherworldly restaurant perched on the edge of a jagged cliff next to a medieval holy city.

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

The sophisticated hydraulic system of the Nazca civilization.

The Dead Sea Scrolls were discovered in the ruins of this ancient monastic community.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

You can row a boat through this ancient underground reservoir.

This Parisian café sticks almost exclusively to an ethos of reuse.

Rare recess caves fill this unbelievably beautiful Ohio park.

Known as the "Hobbit Houses," these storybook homes look like they're straight out of the Shire.