The remains of the great moral philosopher reside in a university in London.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

Charles Babbage's proto-computer, painstakingly brought to life.

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.

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

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

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

These prehistoric replicas were based on actual skeletal remains.

Now a public art piece, this curious metal feature originally advertised a tinsmith's services.

The mastermind behind this palatial hotel perished on the Titanic weeks before its grand opening.

A sprawling Victorian farm that has been surrounded by a capital city is one of Canada's greatest treasures.

These locks on North America’s oldest canal are named after a porcine rock formation.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

The quiet canyon has a tumultuous history involving a doomsday cult.

From Japan to Italy, this California park explores the world's cultures through their gardens.

The ruins of the movie ranch owned by actor and stuntman Ray "Crash" Corrigan.

Drink a Guinness under the wings of Reagan's retired Air Force One in his presidential library.

The White House Situation Room was taken apart in 2006 and shipped to the Ronald Reagan Presidential Library.

A performance hall at the American Jewish University moonlights as a sci-fi film location set.