Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This unique Renaissance castle was turned into a home for Nazi occultism.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

Ruins of a German Castle on top of a towering stone pillar.

The fairy tale castle of the "fairy-tale king."

This ancient mountain monastery welcomes all manner of faith in an effort to keep Christians in Syria.

This ornate mosque is said to hold the remains of Muhammad's granddaughter beneath its dome of pure gold.

The Syrian headquarters of alleged hashish-smoking assassins.

Ruins of the Crusaders' headquarters.

Mysterious lost empire of the Silk Road.

German and American troops joined forces to defend this fortress during the strangest battle of World War II.

An autonomous republic of Orthodox monks.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

This overgrown mountain village has been abandoned for nearly a century.

This winding road through an Italian canyon may be the most scenic drive in the world.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

Mysterious Spanish catacombs of unknown origins.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.