The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."

Many Hindus make the long pilgrimage to this holy city to have their remains burned on the banks of the Ganges River.

Known as the leaning temple, the sacred structure has somehow developed a severe nine-degree slant.

Tucked in Mumbai’s wealthiest neighborhood is one of the city’s oldest and most sacred sites: a temple complex believed to house the waters of the Ganges.

An extraordinary "City of Caves" carved from solid stone.

An ancient iron pillar in Delhi that seems to be rustproof.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A contemporary art installation housed within a Gothic cathedral.

A lush indoor jungle fills this bustling Madrid transportation hub.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

God's Saharan sandbox of wrath.

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

A fortified city, home to a remaining population of five families

The other side is actually green.

One of the most spectacular canyons in the world.

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

One of the best collections of wax anatomical models in the world.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.