When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

The location where the iconic movie character declared it was time to go home.

This balancing rock is one of Utah's most unusual geological formations.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

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

Opened in 1911, this small shop is the oldest ongoing establishment in St. George.

A tribute to the disposable cups that were once manufactured here, this 68-foot-tall statue would be difficult to throw away.

These structures were inspired by both Native American shelters as well as, strangely, an ice cream shop.

The only museum and archive west of the Mississippi that is dedicated to the study of Abraham Lincoln.

The largest drain hole in the world.

Art Deco stylings conceal the true nature of this bridge.

The California capital city once stood 10 feet lower than it does today.

I Street Bridge is the heaviest swinging center bridge in the United States.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

Rusty industrial city full of oxidized distillation towers.

Beneath the southern end of the Golden Gate Bridge is the “Gibraltar of the West Coast,” a fort built to protect the San Francisco Bay from naval attack.

This grinning pup statue is all that's left of what was once a ubiquitous Bay Area diner chain.

A promotional sun clock on the site of San Francisco's great raceway.

Gold Rush-era tombstones line the park's paths.

The giant pair of sexy legs sticking out the window of this costume store have become its main draw.

This concrete tangle of square pipes has stood as a proud thorn in the city's side since the '70s.

This shop and studio is dedicated to the art of the book, from letterpress to bookbinding.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.