Nine limestone rock stacks on Australia's "Shipwreck Coast."

One of the best beaches in the entire world.

Where thousands of slaves passed through the "Door of No Return."

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

Dozens of snakes are housed and worshipped within the walls of this Vodun temple.

This mountaintop lake bubbles and steams in a perpetual boil, thanks to its direct link to the Earth's interior.

A three-centuries-old crypt in the foothills of an old plantation.

The world's widest single drop waterfall, and the two men who legend says went over its edge in a boat.

Trash-filled shrines to an unofficial saint known for her endless breast milk dot the highways of Argentina.

A bright little alley in La Boca is a part of tango history.

Museum precariously perched on a massive yellow pillar.

This striking, two-toned confluence of rivers is visible from space.

A 125-meter long "tribute to the Brazilian people."

A faux desert landscape in the middle of the jungle that sprouts oases during the rainy season.

This Soviet statue is based on a piece of propaganda that's been elevated to national myth.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

Only a fragment of this 15th-century Dance of Death survives today.

The largest hewn stone in history.

The remains of an ancient Roman city are hidden underneath Bologna's beautiful public library.

The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Temple complex that once housed the famous statue of Nike.

This unassuming tree stump reportedly traces its roots to the famous pharaoh queen's reign.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

The lighthouse central to the 1980s horror classic "The Fog" is, in fact, located in one of the foggiest areas of the Pacific Coast.