The tallest stationary dunes on Earth also happen to sing.

A corkscrew-shaped barn in Ireland.

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

360° views of the city plus five floors of optical illusions and hands-on science.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

The hottest place on the planet.

An Ethiopian "Jerusalem" featuring a church hewn out of a single rock.

Founded as a refugee camp, now a popular tourist spot.

Cliffside houses provide a spectacular view from their perch above the valley.

The Ozarks' strangest dwelling.

Dive bar built out of the remains of a whaling ship.

'Cause the fence start shaking, the earth was quaking.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

Monasteries on rock pillars, once accessible only by frayed ropes.

Hollowed out cedar log tubs set in an ancient towering forest.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Ancient paintings known as the "Sistine Chapel of Cave Art."

Houses are tucked between, on, and underneath giant boulders.

Abandoned medieval hill town.

Traditional 15th century Chinese garden in the middle of Vancouver.

Shop the world's largest number of ice cream flavors, ranging from delightful to downright bizarre.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

Olfactory delights in San Francisco's Botanical Gardens.