These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

This network of narrow, medieval passages has the most delightful name.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

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

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

A historic and oft-filmed prison stands in a Chicago suburb.

Every week, a festive public jam session breaks out in downtown Asheville.

One of the few remaining relics of the meatpacking hub that made Chicago the "hog butcher to the world."

This circus town museum recognizes the outstanding clowns of history.

This unique zoo is the only place in the world where you can see all 15 species of crane.

The castle still holds traces of the abandoned Roman fort it was built atop.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

One of the oldest theaters in Australia, it's also said to be haunted by a performer who died on stage.

So many migrating birds roost on the bridge, it has a special summer speed limit.

England’s ancient oak tree has such an impressive girth, people have been hosting parties within the hollow trunk for centuries.

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

A full-scale replica of a 1774 colonial settlement in Kentucky.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

A historic beacon built in the aftermath of the worst maritime disaster on the Great Lakes.

A statue honoring 44 continuous years of greeting passing ships.

This kitschy tavern is also home to rare early editions of "Treasure Island."

Every birth, death, and marriage is recorded in these color-coded leather-bound books.

What looks like a normal building is really a hollow facade hiding a subway vent.