Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

The remnants of an archaeological camp stand within Tikal National Park.

At least seven hues of blue and turquoise make this freshwater lagoon unique.

These azure waters were thought to lead to the Mayan Underworld.

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

An ancient system of freshwater caves filled with animal bones, including that of species long-extinct.

One man's fulfilled dream of living on an artificial island made of recycled plastic bottles.

Beach instrument turned bed and breakfast.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

This 80-year old mannequin is so lifelike it is believed to be an embalmed corpse.

A US military accident created the legends behind this Mexican version of the Bermuda Triangle.

A historic cemetery doubles as a museum containing hundreds of unique tombs sculpted by a single artist.

A garden in Lisbon filled with giant porcelain creatures.

A collection of memorabilia from the Beat era in the back of a San Francisco bookstore.

A popular tourist cave with a dark past.

A large instrument played by the wind.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

One of the last free public hot springs is decorated with hippie art.

Her final resting place was intended to be modest and private, but the power of her popularity continues to draw visitors.

Secret Manor, a house full of legends, the least of which is the haunting of long-deceased ladies of pleasure.

Named after a bandit and the star of several Hollywood prehistoric landscapes, these sandstone formations are a historical part of the Los Angeles natural landscape.

The art and history of the velvet painting are on full display in this Los Angeles museum.