The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

This coffee shop lies hidden beneath a historic church.

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

Hear the quietest sound from across the dome.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

Inspired by a piece of concrete, these three pyramid-shaped buildings have been beloved Indianapolis landmarks for over 50 years.

This rock formation above the Wabash River is part of an ancient coral reef.

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

You thought Santa Claus didn't exist, but it turns out you were wrong.

Lions and tigers and leopards, servals, pumas, bobcats, lynxes, and ocelots... oh my!

One of the largest collections of merchandise from the famous British sci-fi show can be found smack in the middle of Indiana.

This Indianapolis landmark offers a secret panoramic view of the city.