This whimsical campus lawn is dotted with large sculpted numbers and hidden mathematical formulas.

A single handprint, which, according to Ohio State University legend, cannot be scrubbed off.

At the top of the hour, this steam-powered clock's eight brass whistles play "Back Home Again in Indiana."

A monument to the King's final show, complete with a time capsule.

This stately clubhouse has showcased German-American culture for over a century.

The body of one of the world's most famous outlaws is covered in cement and iron to prevent it from being stolen.

A 30-year-old Sycamore tree grown from a seed taken to the moon and back.

Once adorning a New York skyscraper, these reclaimed ruins now haunt an Indiana park.

A giant, Gilded Age mansion that once belonged to the beer baron of Milwaukee.

What do we know about the real woman behind one of the Beatles' most famous songs?

The Liverpool street made famous by the Beatles is real.

The quiet field that inspired one of the most famous songs of all time.

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

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

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the first ‘Harry Potter’ film.

The concrete shell of an industry giant remains as a playground for graffiti artists, auto scrappers, and paintball warriors.

Advice-columnist's bell tower, paid for with pennies.

Controversial tribute to the heavyweight champion boxer who grew up in Detroit.

Detroit’s downtown castle is one of the oldest structures in the city.

To truly appreciate Detroit's landmark skyscraper, you have to step inside.