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

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

When ecosystems collide in the arid Southwest.

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

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

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

This hidden stream beneath Indianapolis makes an appearance in the best-selling novel "Underground Airlines."

An abandoned town is hidden in Great Smoky Mountains National Park.

After a water tower painting was accused of being an ad, a simple fix was made that gave the city a motto.

An abandoned theme park with a strange and tumultuous past.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

The world's longest known cave system.

A giant lumpy candle serves as a beacon for this highly scented pit stop.

This stately clubhouse has showcased German-American culture for over a century.

A historic hotel library in Indiana hides more than a few secrets on its shelves.

For over 100 years, this Indiana town has had a tree growing out the top of the local courthouse.

The bespectacled, cocktail-sipping pachyderm is a strange but fitting liquor store mascot.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A medical facility that has been kept frozen in time.

This restaurant proudly displays bread signed by the 39th president.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

The largest ancient burial mound in Ohio.

Rare recess caves fill this unbelievably beautiful Ohio park.

This red-eyed chrome beast pays homage to the popular modern myth of West Virginia's insectoid monster.