The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.

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

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

Home to items never before seen by the public.

Mysterious rocks that ring musically when struck.

Formerly known as National D-Day Museum, this collection commemorates the battles of Normandy and WWII.

A 200-year-old building in the French Quarter that was to be Napoleon's home in the New World.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

A convincing little bit of ancient Egypt smack dab in Richmond, Virginia.

This marine reptile was discovered by one of the 19th century's greatest fossil hunters.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

A naturally mummified 2,000-year-old man.

Eighty million natural history specimens call this gargantuan museum home.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The final resting place of the "father of special effects."

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

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

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

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