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

The rose garden in Regent's Park where Pongo and Perdita met for the first time in Disney's "101 Dalmatians."

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

This beautiful deer park was built so King Charles I and his court could go hunting while escaping a deadly plague outbreak.

One of England's most famous churches hides a pair of little known architectural treasures.

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Eighty million natural history specimens call this gargantuan museum home.

Plaques on its facade commemorate the Tiber's most destructive deluges.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This cathedral hides a sculpted dog that determines your fate and an unexploded shell from World War II.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

This breathtaking monastery was established by Saint Benedict himself 1,500 years ago.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The world's most active stratovolcano is almost always erupting.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

Pilgrimage site for star-crossed lovers.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

Five candy-colored villages on the Italian Riviera.