Two stone columns flank the grand Venice square, but there were supposed to be three.

Go inside to really appreciate this 500-year-old technological masterpiece.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

The blood-soaked ruins of the castle where the murderous Blood Countess was walled in alive.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

American soldiers discovered Europe's best one-liner at the end of World War II.

Go surfing on this urban wave, "hacked" by local surfers.

The history and future of cannabis.

Eighty million natural history specimens call this gargantuan museum home.

This innovative steam machine was no doubt the most famous of the pioneer locomotives.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

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

An unusual round church in London with a Templar past.

Public access to clean drinking water was an instant hit among the masses.

Hear the quietest sound from across the dome.

The commemorative stone column conceals a secret laboratory.

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

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

The oldest working mechanical clock in the world.