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

A museum dedicated to the alleged Roswell Incident.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Roadside collection of 65,000 signs.

A giant poultry statue immortalizes one of Alaska's more humorous town names.

Siberian husky that delivered a life-saving antitoxin.

The king of U.S. high points towers over every other peak on the continent.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

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

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

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

Cave where bat-eating snakes hang down from the ceiling.

The youngest volcano in Central America.