A subterranean shelter remains intact under a busy Paris railway station.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This French chateau is home to the world’s largest private collection of fighter jets.

The Cimetière des Chiens et Autres Animaux Domestiques is one of the oldest pet cemeteries in the world.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

This ruined quarry once produced the distinctive red sandstone used for construction projects in Washington, D.C.

America's first nuclear-powered merchant ship is now a time warp to the atomic age.

A collection of artifacts from Maryland's maritime past.

Once America's tallest structure, now a Baltimore landmark.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

This historic toy museum brings a little whimsy to a city not usually remembered for such things.

Nestled on the banks of a river in Nuremberg is a small museum that was once home of the city's official executioner.

The "feral child" who appeared in Bavaria in the 19th century remains as much a mystery as his unsolved murder.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

A stairway to heaven, or to nowhere at all.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

This Berlin island is home to a flock of free-roaming peacocks, as well as a historic ivory folly.

No need to strap in for a "ride" on this walkable roller coaster.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

A unique Holocaust memorial tells the personal stories of the Jewish residents exiled from greater Berlin.

The largest police museum in the western United States displays the evolution of crime-fighting Seattle.

Once a year, thousands of naked cyclists flood the streets of a Seattle neighborhood.

A nondescript Seattle restaurant inherited a piece of European history.

This small, rural pioneer cemetery is full of interesting grave markers.