A wall of chewing gum moonlights as collective art.

There’s a hidden military meme engraved on the World War II Memorial.

Home to items never before seen by the public.

Historical figures from New York City's Catholic community reside in Midtown.

Cleveland's giant "free" stamp is a nod to the Civil War, but was misinterpreted for years.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

This popular bar has been blurring the line between normal and edgy for more than 75 years.

Seattle's own bad art museum located inside Cafe Racer.

A museum dedicated to the history and exploration of both popular music and science fiction.

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

A giant Troll lurks under one of Seattle's oldest bridges.

The original toys that inspired the beloved children's stories are on display at the New York Public Library.

This whimsical group of statues is a favorite of children who love to climb all over Lewis Carroll's beloved characters.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

The medieval woodcut-style artwork chronicles life in medieval London.

The bones of two medieval royal lions were discovered at the historic fortress.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Eighty million natural history specimens call this gargantuan museum home.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Yo, Adrian!

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.