A mental health hospital dating back more than 139 years, now features a museum.

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

The building stands within a quiet, postcard-perfect New Mexico village.

This naturally-sourced hot spring is now home to a clothing-optional resort.

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

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Hidden high on a remote mountain peak is a humbling and mysterious Vietnam War memorial.

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

Community owned and operated, this property is home to a diverse set of nudists.

Gleaming self-built castle towers made from beer cans and inspired by "Vitamin Mary Jane."

One woman's UFO-themed campground, complete with self-built energy vortexes, UFO-themed weddings, and magic bushes.