The land is home to swimming ponies and a legendary 18th-century treasure.

This building at the south end of the boardwalk was once home to the U.S. Life-Saving Service and the U.S. Coast Guard before being rescued itself.

The stone marker that Mason and Dixon placed at the eastern end of the famous north-south border they surveyed.

The last SR-71 ever constructed.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

This otherwise unremarkable ski town building marks the site of Butch Cassidy's first robbery.

Take a self-guided tour through one of Colorado's most elevated mining districts.

Once owned by the largest employer in Colorado, these ovens have been abandoned for over a century.

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

Take a dip in the world's largest mineral hot springs pool.

Abandoned silver mine strewn with wrecked and twisted structures.

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

Wildflower-filled 19th-century cemetery is a bucolic final resting place.

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

The narrow mountain road that carves a path between Florence and Victor is tied to ghost towns and ghost stories.

The largest source of fossilized insects anywhere.

The highest paved road in North America winds its way up Mount Blue Sky in Colorado to an altitude of 14,130 feet above sea level.

A mural and a few historical markers commemorate Denver's once-thriving Chinatown, which was obliterated in a racist riot.

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

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

More than 100 steam and diesel locomotives bring Colorado’s rail heritage to life.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

In the middle of a busy airport, a statue honoring the astronaut who told Houston that Apollo 13 had a problem.

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