An ancient knight and a symbol of the city's freedom.

Gargoyle head that brings good luck.

An alchemist's "magic door" stands in the middle of a Roman park.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The oldest stone house in Paris was built by its most famous alchemist.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This one has sailed five times as far as Sir Francis Drake's famous ship.

The London statue that imitates passersby.

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

The school tested mustard gas for the U.S. Army during World War I.

The unique traffic pattern named for an influential urban planner is also known as the Pedestrian Scramble.

Washington's iconic carousel has a nice piece of Civil Rights history.

Decades before the scandal, this staircase on the river was a literal "water gate."

The only Civil War battle in Washington D.C. took place near this highest natural point in the city.

The beloved statue at the National Academy of Sciences is oh so inviting to sit on.

This grand gothic brewery has been pumping out suds for over a hundred years.

The site of the climactic scene from the classic horror film is now a historic landmark.

Home to items never before seen by the public.