This army of concretions is an unexplained geological phenomenon unlike anything else in the world.

A beautiful gorge filled with streams and waterfalls.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

The hottest, driest, and most scenic desert on Earth.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

Known as the "Valley of the Moon," this Jordanian wadi is one of the most amazing desertscapes on Earth.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Rare karst landscape eroded from a flat seabed.

A good place to research the Freemasons, esoterica, occultism, and hermeticism.

Rippling sand dunes frozen in the Arizona rock.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A spring water stream jumps through a walkable "bridge" cavern and a narrow canyon.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

One of the most spectacular canyons in the world.

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

Every Easter, a small Sicilian town builds a stunning cathedral out of bread.

This enchanting natural park is a magical example of a temperate rainforest in Europe.

Strange rock formations tower above the river that snakes through this enchanting Icelandic canyon.

A surprisingly beautiful abandoned World War II military base in East Greenland.

This limestone cave offers an incredible view of the Río Grande de Arecibo valley.

This charming, medieval walled village is Spain's first "book town."

The world's oldest bookshop still in operation.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.