The oldest and smallest cemetery in Paris is only open to the public twice a year.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

The abandoned site of the Beatles spiritual awakening and subsequent revolt.

A startling, centuries-old subterranean marvel hides in plain sight.

Also known as the "Red Taj Mahal."

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

Small church built in the 19th century for whites and slaves to worship together.

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

The oldest colonial fortress in the Americas was once the home and later prison of Christopher Columbus.

This huge pile of volcanic boulders hides a stunning network of secret grottoes.

Divers can encounter an abandoned warship encircled by a giant kraken submerged in the British Virgin Islands.

Swim or sail to this pie-slinging boat off the coast of St. Thomas.

Rumored to be the famed pirate's lookout tower, this historic stone structure is now just watching for tourists.

A sharply wedged sundial marks the point at which each day in the United States begins.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

Sloth rehabilitation center in the jungle of Costa Rica.

This clock was gifted to Mexico as a show of gratitude for its long history of welcoming Arab migrants.

A coastal monument honors one of Mexico's most notable immigrant groups.

This once prosperous community was home to European settlers and the Ojibwe.