A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Among the oldest structures in Madrid, these Moorish walls once guarded the medieval city of Mayrit.

A towering monument in Spain has proven to be more labor-intensive than initially planned.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

An ancient Egyptian temple in the middle of Madrid, Spain.

The future of roadside attractions is this sci-fi soda mecca that is home to a 66-foot tall neon pop bottle.

Along the historic Mother Road is an old gas station with a secret counterfeiting past.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

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

A face emerges from the landscape when seen from the air.

"...I guess that was your accomplice in the wood chipper?"

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