Once an unstoppable source of gold and silver, this town came to a grinding stop when the groundwater proved deadly.

The remnants of the base where US Army troops learned how to fight in extreme conditions.

At one time this small mining village was the highest town in America but now it sits abandoned while the mine churns on.

The site of a defunct mill, that once supplied marble for the construction of the Lincoln Memorial.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

This interpretive path lets you get up close and personal with dinosaur bones.

Two creeks flow out of either end of this canyon in opposite directions.

The first railway tunnel to cross the Continental Divide and, at 11,523 feet, was once the highest railroad tunnel in the world.

This nearly abandoned town was once a thriving mining community until a series of fires.

A glimpse of a waterfall is reached by a steel catwalk along a slot canyon located in an Ouray city park.

This spectacular track has run continuously since 1882.

A whimsical roadside community of little metal people.

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

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Explore a misty river canyon from a metal bridge system.

This quirky hot springs town known to locals as "T or C" was named after a radio show.

This is one really big nut.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A cave's rare beauty held a cavernous secret hidden underground.

A blacklight journey through a celestial art exhibit.

The world's largest squirrel statue clutches a pecan bigger than your head.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

An abandoned mine where dreams of quicksilver trickled away over 75 years ago.