This garden is dedicated to a Portland cartoonist who specialized in dark humor.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.

This three-mile concrete levee in Pueblo, Colorado was transformed into the world’s longest painting.

A futuristic hovertrain is parked unceremoniously alongside a nondescript road.

A mental health hospital dating back more than 139 years, now features a museum.

This naturally-sourced hot spring is now home to a clothing-optional resort.

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

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

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

The moving metal works of one troubled artist can still be viewed on his front lawn... for now.

Victorian "Fancy Craft" Hair Wreaths and Relics.

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

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

This super steep hike ascends 2,000 feet in less than a mile.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

The superstar of Cold War nuclear bunkers has been featured in countless films but is now barely operational.

This grand stone tower was dedicated to a famed American humorist almost by coincidence.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

A prehistoric rock shelter that's literally in someone's backyard.

In the middle of a suburban Denver neighborhood is a cave that once provided solace for a prominent Ute chief and his family.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

One of the greatest heroes of the Titanic tragedy came from humble beginnings to this beautiful home.

A downtown park built on top of unclaimed graves.