This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

The glacier tucked within a New Zealand rainforest.

This strange geological landscape erupts with sudden bursts of water.

A glacier pocked with ice caves and surrounded by rainforests.

Tubing through a cave lit with glowworms is a magical underground experience.

Dolphins, ancient clams and hundreds of waterfalls make this one of the world's top tourist destinations.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

A charming beach town in Turkey captures all the colors of the rainbow.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Deep in the Guatemalan jungle stands an ancient pyramid that once marked the reign of a king.

Monkeys inhabit the lush forest surrounding ancient Mayan ruins once considered sacred.

Bangkok's men with dangerous jobs come here in search of protective talismans.

This dazzling Buddhist temple was constructed from over one million ceramic tiles salvaged from a British shipwreck.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

The most famous location in China was home to whole dynasties worth of imperial rulers.

270 million year-old forest of stone.

See no evil, hear no evil, speak no evil.

The quintessential Japanese rock garden has existed for more than 500 years.