A charming Spanish village sits atop this natural limestone overpass.

Stormy conditions send jets of seawater bursting through holes in the cliffs.

An uninhabited village that preserves and documents rural architecture and an endangered way of life.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

Picturesque intersection of witchcraft and ancient Christianity.

In Portugal, a secluded stretch of untouched natural beauty hides at the bottom of a steep hill.

A Spanish artist builds his own castle.

Rare karst landscape eroded from a flat seabed.

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

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

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.

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

This super steep hike ascends 2,000 feet in less than a mile.

Hidden beneath a bridge, this waterfall is known for the large amounts of graffiti painted on its base.

This Colorado fire station has been in continuous operation for more than a century.