Petrified footprints of one of the very first vertebrates to walk on land.

A favorite with sightseers, this Norwegian funicular provides easy access to a stunning view of Bergen and its environs.

Island ghost town detailing Flagler's folly in building the Overseas Railroad.

A hugely vast Irish landscape of barren rock that stretches for miles.

A cone-shaped top and cylindrical body set this 900-year-old structure apart from other Italian bell towers.

This vestige of Seychelles’s colonial past now resides in a busy intersection and didn’t chime for its first 96 years.

Berlin's old airport.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A meteorite-bounded town in Bavaria.

Hidden in the forest are the crumbling, graffiti-covered remains of the factory where most of Germany's explosives were produced during World War II.

Hidden in the forest are the remains of a former World War II chemical plant.

The world's first jet-powered aircraft were assembled by the Germans in this secret factory in the forest during WWII.