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

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

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

A small flooded ghost town with a few scattered structures remaining.

The remains of this early 20th century refinery loom on a mountainside like a graffiti-covered fortress.

This geothermal hot spring hides beneath a slowly growing mineral dome.