An ADA-accessible trail and deck offering stunning views of Colorado’s Mount of the Holy Cross.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

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

Stories of sightless fish and ghostly cowboys are only a fraction of the legends surrounding this Kansas sinkhole.

The remains of this hell for leather wild west town can still be found in the Arizona desert.

A funhouse dummy that turned out to be a real life mummy, Elmer McCurdy is an urban legend come true.

In the remote high desert of New Mexico, a strange array of poles beckon fury from above.

Commonly acknowledged as the only public monument to the Devil himself.

Rippling sand dunes frozen in the Arizona rock.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

A whimsical tower with a spiral staircase, inspired by the Space Age and the Möbius strip.

Deadly airliner crash preserved for those willing to climb and pay respects.

A Mars simulation in the southern Utah desert.

A lush indoor jungle fills this bustling Madrid transportation hub.

A preserve with 75,000 ancient drawings remains the realm of public – not just scientific – exploration.