If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

A site where “the ravages of the war are more striking…than any other place in contemporary Spain.”

A breathtaking canyon offers stunning views and frightful pathways through an ecological paradise.

Hundreds of stone stairs and a winding medieval bridge connect this haunting Spanish island to the mainland.

Stunning Roman aqueduct used for 1900 years and still standing.

This ancient Spanish castle sits high upon a hilltop.

Mine shafts and hard pastries await visitors at this massive mountain of salt.

A Spanish forest is filled with mysterious stone carvings.

This semi-secret storybook hedge maze is also the oldest garden in the city.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

A beautiful but toxic fountain of mercury.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A temple to modernity, tucked away amid Barcelona's more well known museums.

The red brick house where the father of rock 'n' roll wrote some of his classic hits.

One of the world's largest automobile junkyards is a unique landscape of metal and moss.

A tiny red pebble marks what may be the quietest outdoor spot in the United States.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

An elevator into the Baltic Sea.

A Buddhist temple to honor insects that died for science.

The most magnificent bottle house in a town strangely full of them.

Sitting on an Italian hilltop is this surreal fortress built by the mad inventor of electrohomeopathy.

In paradise, feral pigs have claimed an island all to themselves.