Those with a sharp eye can find the hidden image of a German Shepherd on the memorial's Mural Wall.

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

Abandoned silver mine strewn with wrecked and twisted structures.

Derelict buildings are all that remain of a complex at the site of one of the worst mining disasters in Montana history.

The Cathedral of St. Ambrose has been hiding a special parishioner within its walls.

Abandoned medieval hill town.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

The remains of a town so thoroughly destroyed by French forces that the citizens simply left.

This Italian foot path winds through the mountains via 52 individual tunnels.

The titular "little arch" near this Italian resort is one of the most popular diving spots in the country.

The prototype for all Nazi concentration camps.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Home of what was the largest hydraulic mine in the world, producing gold and the first diamonds in the U.S.

Windblown rock formations in an ancient Roman quarry.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.

Hideout of thieves, monks, and goat-footed gods.

Thirteen trees representing the original thirteen colonies were planted with soil from historic Revolutionary battlefields.

An emerald-green grotto just a short trip from Austin.

A popular swimming hole that hides one of America's most deadly diving spots.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

A submerged archeological park still holds the wonders of a Roman Sodom.

Haunting and beautiful trees, doomed to die.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.