The largest source of fossilized insects anywhere.

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

This statue of an obscure comic strip hero stands as a tribute to patriotic service and a cautionary tale about embracing fads.

This underfoot portrait is the work of a disgruntled painter inspired by a tragic poem.

This deserted Gold Rush town is home to a Masonic lodge that, strangely enough, still holds meetings.

The burial grounds of a secret society includes fences topped with fake Tesla balls.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

This sidewalk tribute honors Colorado's great culinary creation.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

A museum dedicated to the alleged Roswell Incident.

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

It's easy to forget what century it is as you wander this rustic homestead.

Birds with backpacks expedite film development for a rafting company on a remote Colorado river.

The oldest operating cemetery in Denver is the eternal home of some of the Centennial State's most famous residents.

A seven-story 1920s mausoleum outside Denver houses thousands of remains.

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

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

A museum of natural history, Edwin Carter's original log cabin home and workshop houses taxidermy specimens.

The symbol was surreptitiously built into the river bank by German prisoners of war.

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

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

One of the most powerful computers in the world can be visited by anyone who wants to experience more computing than they can handle.

Travel through the wholesome amusements of yesteryear at this charming miniature village.