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

The site of the "Bone Wars" between two rival paleontologists during the dinosaur rush of the 19th century.

This 19th century jail was mainly used to incarcerate the drunk and disorderly.

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

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

Inside this casino, visitors are treated to slot machines and a rare German Christmas pyramid.

There are eight natural springs around town, each with a slightly different taste.

This enigmatic building features numerous architectural styles.

The largest source of fossilized insects anywhere.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Small teepee-like houses built for TB patients have become sheds, studios, and bus stops around Colorado Springs.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

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

The haunted reputation of these abandoned Colorado train tunnels is probably not helped by the terrifying spiked fence.

See six states, pickled freaks, rocks, and antiques.

This Boeing KC-97 tanker is now a restaurant for aviation lovers.

Massive still life just off the highway in Kansas.

The oldest house in Lindsborg, Kansas, includes some fascinating inscriptions.

A diverse, expansive nature preserve in northeastern Kansas.

A spiritual center in the Santa Monica Mountains founded by Alice Coltrane after the death of her husband and fellow jazz musician John Coltrane.

Decommissioned experimental solar facilities that pioneered solar energy technology.

In one of the hottest parts of the Mojave Desert, shallow bedrock forces the typically dry Mojave River to the surface in this canyon, providing a vital oasis for humans and wildlife.

The American rainmaker and a burst dam.