These half-buried combine harvesters just off Route 66 are an homage to the Cadillac Ranch.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This unusual lava tube spouts seawater during high surf.

This abandoned building made of petrified wood was once a hotspot for buying moonshine.

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

See massive fossils that are over 200 million years old in northeastern Arizona.

Oddly shaped rock formation, misassociated with a nearby utopian community.

From Nunavut to Tierra del Fuego, you won't find any lighthouse higher than this one.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

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

The ruins of an important pilgrimage destination for worshippers of a Maya fertility goddess.

Some of the best pastries in "the Czech heritage capital of Texas" come from a gas station off I-35.

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

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Abandoned railroad tunnel is home to a colony of three million Mexican free-tail bats.

This museum showcases the history and contributions of the U.S. Army to the medical industry, both on the battlefield and off.

A National Historic Landmark with a scenic clock tower and park filled with deer and peacocks, plus a military museum.

Colorful curls of hand-blown glass form a captivating tower in San Antonio's Central Library.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

An enormous pink granite batholith, long attributed with spiritual powers by the Tonkawa Indians.

An immense cave that has served as an outlaw's treasure trove, an underground dance hall, a nuclear fallout shelter, and much more.

This grimly-titled Texas cemetery is all that remains of a Wild West settlement with possibly the worst name.