An architectural oddity hides in plain sight on this iconic London bridge.

This network of narrow, medieval passages has the most delightful name.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

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

Where condemned pirates met their grisly end at the gallows on the River Thames.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

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

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

When a medieval fire claimed the original St. Stephen’s Cathedral, it sparked a pattern of unquenchable organ building.

A Black Forest cuckoo clock theme park features one timepiece big enough to walk inside.

This strange statue features a bust of the famous composer plopped atop a woman's body.

The site of Austria's biggest concentration camp now honors its victims.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

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

Each year melting snow turns these Austrian hiking trails into scuba zones.

Follow the original medieval paths that wind through this intriguing section of the city.

This magnificent mural was created with over 30,000 colored bricks.

A tribute to the women who quietly kept the local steelworks alive during both world wars.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

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

This tremendous timepiece was once the largest cuckoo clock in the world.