This 19th century train workshop is a treasure trove of railroad history.

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

The tallest bridge in California was constructed for a project that was eventually cancelled.

A dentist's hated concrete colossi are now beloved icons of the community.

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

Art Deco stylings conceal the true nature of this bridge.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

This historic Union Pacific Railroad depot is a stunning symbol of American post-Civil War progress.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

This prison-turned-museum is a remnant of the Old West's grizzly, violent past.

A popular rock that acted as a waymarker for American pioneers.

A devilishly named gorge that was a sign of salvation for many pioneers.