A walk through the historic city center, under the streets of Seattle.

At almost 1,000 years old, this is the oldest known door in all of Britain.

Tourists who rely on a transit map to find the iconic Beatles location often end up in a far-off neighborhood.

An archive of ceramic eggs painted to record clowns' personal makeup designs.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

Collection dedicated to brands, packaging and advertising.

The television series' iconic giant foot was borrowed from this classical painting.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The curious underground history of keeping Paris clean.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Paris' linguistic guide to the international language of, yes, love.

This massive library holds what was once the largest book collection in the world.

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

Home to a dizzying array of letterpress blocks with a rich history.

An institution dedicated to the towering buildings that make up skylines in New York City and around the world.

One of the deadliest American air disasters is nearly forgotten in Brooklyn.

Even for Egyptian royalty, the afterlife was bring-your-own-beef.

A mysterious statue of a leather jacket-clad rebel leans coolly on an odd yellow clock.

Despite not growing anywhere near New York City, bananas are ripened in a pressurized room in the Bronx using precise banana science.

The gilded vestiges of a sterling department store can still be found in a Brooklyn shopping center.

Manhattan's deadly West Side railroad, which killed hundreds of New Yorkers, is remembered by this simple plaque.