Roughly 17 million letters to Santa have found their way to this Arctic Circle post office.

A beautiful Arctic museum and nature center preserves the culture of the Sámi people.

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

A whimsical bridge adorned with decorative dragons.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

This 17th-century structure is a beautiful testimony to traditional Persian architecture

Marked by the hand of the explorer Henry Morton Stanley.

Long before air conditioning, Persian architects found an ingenious way to cool off.

The fire inside this temple has burned for more than 1,500 years.

This 12,000 year old Iranian cave village has been continuously inhabited for over 3,000 years.

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

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

17th century mosque for Shah Abbas' harem.

These little castles each held thousands of pigeons.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.

A spectacular rainbow of stained glass makes the "Pink Mosque" one of the most beautiful in Iran.

The palace of the King of Kings, burned by Alexander the Great.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

This massive monument towers over the city as a constant reminder of the lives lost during Algeria's hard-won war for independence.

This former cathedral is now a bustling library packed with students and pigeons.

This dizzying span over the ancient Algerian city was once the highest suspension bridge in the world.

This grubby wall is said to be one of the Earth's esoteric energy centers.