Life-sized sculpture of a blue whale made of hand-recycled plastic trash.

Thousands of mounted insects, and some live ones, hide within an otherwise ordinary shopping mall.

Climb to the top of this spiritual tower, and you'll be rewarded with spectacular views.

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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

A tribute to Loveland’s most famous sweethearts, who helped spread cupid’s message to millions.

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

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

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

One of the largest Buddhist stupas in North America is built of concrete designed to last 1,000 years.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

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

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

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

An architect in Aspen used psychedelics as his muse while building this mushroom masterpiece.

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

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

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

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

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

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

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.