This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Furniture tries to escape an abandoned building in San Francisco.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Caves famous for the dragon-slaying saint who lived there.

This Italian foot path winds through the mountains via 52 individual tunnels.

Roman ruins top white travertine terraces formed by ancient hot springs.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

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

A massive underwater sinkhole made famous by Jacques Cousteau.

An exquisite tunnel of cascading flowers.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

17th century mosque for Shah Abbas' harem.

The small cliffside monastery known as the Tiger's Nest is said to be the meditation site of an 8th-century Buddhist master.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

The atmospheric road was never meant to be so creepy.

Bask in the 19th century grandeur of an eccentric Freemason millionaire's private gardens.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

Wonderland replication in progress by one persistent man.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.