See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

A multiversal transit station located right below a highway interchange.

A sprawling maze of used books piled from floor to ceiling.

Ruins of a Carnegie family mansion on Cumberland Island.

The remnants of the fortress that saved Georgia from the Spanish still stand guard on their swampy island.

The giant squid's 27-foot-long corpse lies preserved within a Sarasota aquarium.

I-95's Tijuana-style celebration of kitsch at the Carolina border.

This former Cold War missile control site played an important role in the creation of GPS.

Pennsylvania's highest point is spotted with boulders which were pushed to the surface by nothing but cold.

This two-room shotgun shack in Tupelo is the birthplace of a King.

This historic hotel on Bathhouse Row in Hot Springs National Park has a storied history of gangsters and baseball greats.

A local museum honors Wheeler native Alan Bean, the fourth man to walk on the moon.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

Once a lonely sentinel on the edge of the Great Plains, this rebuilt trading fort offers a glimpse of life on the Santa Fe Trail.

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

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A one-of-a-kind sundial at the Very Large Array honors a radio astronomy pioneer, incorporating the original piers from his breakthrough radio telescope.

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."

This candy-striped tower is the farthest east you can go in the United States.

This statue commemorates the meeting of the most influential minds of the women’s rights movement.