Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

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

Possibly the world's only drive-in movie theater with an attached motel.

The spot in the Mile-High City that's exactly 5,280 feet above sea level (at least for now).

A collection of over 15,000 zines works to preserve DIY publishing culture.

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

The world's largest key collection features keys to the White House, Frankenstein's castle, and Hitler's bunker.

Colorado's only true geyser is hidden within the San Juan National Forest.

The largest source of fossilized insects anywhere.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

Rather than a run-of-the-mill franchise hotel, this lodging has been decked out in dinosaur decor.

A little-known hot spring haven right below the highway.

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.

Despite being one of the most photographed vistas in the Rockies these twin peaks are rightfully known as the "Deadly Bells."

When ecosystems collide in the arid Southwest.

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

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

The largest medical and anatomical collection in France lies hidden from the public.

The narrowest street in Paris.

A series of abstract, silly sculptures represent the works of a great modern classical composer.

Indents in the pavement are all that remain from a grisly death machine in Paris.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This simple stone monument honors a 19th-century tragedy.