This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

When zealous marijuana enthusiasts kept stealing the "Mile 420" highway marker, the State of Colorado got creative.

The largest source of fossilized insects anywhere.

When ecosystems collide in the arid Southwest.

Largest collection of mounted dinosaur specimens in the world.

The extensive collection of an amateur naturalist.

Display that gathers the basic elements of the universe in one convenient location.

The crash of this great airship signaled the beginning of the end for dirigibles.

The site of Neil Armstrong's first flight is marked by a full on replica of the moon landers.

A favorite of Amelia Earhart, ranking among those rare bridges that can be crossed without changing sides of the river.

The largest earthwork effigy in the world.

A whimsical monument marks the highest point in Kansas, not that you could tell by the looks of it.

This pun was simply waiting to come to life, and one defense contractor made it so.

A sign marks the plane crash that caused two nuclear bombs to fall in North Carolina.

Garden dedicated to native carnivorous plants and site of huge flytrap heist.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

The man who was president for only one day and spent most of it asleep.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.