This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

This iconic 1958 tower welcomes air travelers to Tucson with neon-lit letters and architectural style.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

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

This historic national park is covered in the stunning ruins of red rock pueblos.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

A spiritual vortex among the red rocks in Sedona.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

Ancient pueblos built into the base of a natural canyon wall.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

One of the only Florida forts to remain in the hands of the Union all through the Civil War still stands as a historic stronghold.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

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

A dramatic, 360-degree recreation of Pickett's Charge in the Civil War.

At 207 feet, one of the world's longest continuous escalators.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

The world's smallest commercial theater is set up in what was once a urinal for Victorian men.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Scattered throughout London are ancient remnants of the city's former bounding wall.