The highest bridge in America was built for an almost unnervingly small amount of money.

The largest self-built castle in the U.S., six decades in the making.

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

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

When ecosystems collide in the arid Southwest.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

It is the only marker for one of the most famous hate crimes in American history. There are no other memorials for him in the entire state.

Miraculous tree that seems to sprout out of solid rock.

A century-old cabin off of Highway 30 touts an unusual construction material: dinosaur bones.

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

A collection of fading fantasy tchotchkes lines this dirt road in the Colorado wilderness.