Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

The oldest pictographs on this decorated rock formation in California's Carrizo Plain date back as many as 4,000 years.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

In the "Danish Capital of America," a replica of one of Copenhagen's most iconic buildings.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

This former mining railroad is one of the best-preserved short lines in North America.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

California's largest steel arch bridge.

These markers are used to document elevation changes around the famed dam.

This sign designates the road that leads to the infamous Area 51.

Home to the deepest rift anywhere on Earth.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

A Wild West saloon that helped define a generation of psychedelic rock.

This quirky piece of naval artillery has been deafening Canadians for over a century.

The first Protestant church in Arizona and only Gothic Revival style adobe church in the world.

The oldest house in the capital of Silicon Valley.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

An eccentric home stands out in an otherwise average neighborhood with mosaics, mini topiaries, and kinetic sculpture.

A tiny survivor of the Donner Party disaster.

This 19th century hydroelectric powerhouse was the first of its kind.

This museum looks at the history of one of America's most famous prisons and most beloved albums.

The only standing town in the United States that early Chinese Americans built for themselves.