An antique narrow gauge railway line still running through the Colorado and New Mexico mountains.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

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

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

This razorback ridgeline has doubled as a scenic drive since the early 1900s.

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

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

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

The clock that sets them all.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

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.

Abandoned silver mine strewn with wrecked and twisted structures.

This spectacular track has run continuously since 1882.

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

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

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.

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

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

This structure among the trees was the result of divine inspiration.

The alley connecting two of country music’s most historic venues has a rich history of its own.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

This defunct, fortress-like prison has been the setting for several movies.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.