At almost 1,000 years old, this is the oldest known door in all of Britain.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

In the summer of 1957, a massive architectural exhibition showed off the future of urban living in this German neighborhood.

It’s fun to stay at the YMCA… but at this London outpost, it’s even more fun to eat the Bombay aloo.

Two tombstones associated with the much-beloved children's story.

An abandoned NSA listening post on Berlin's "Devil's Mountain."

The world's longest continuously running show has played at this small West End theater since 1974.

A memorial for public executions that dates back to the 14th century.

This statue includes the molehill that toppled a king.

The original burial place of this preeminent 18th-century Jewish philosopher was razed by the Nazis.

This sprawling Jewish cemetery is one of the largest in Europe.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

For more than 170 years, this family-run bakery has been serving Berlin’s best Baumkuchen, or “tree cake.”

Home to 10,000 medical specimens including the remains of Rudolf Virchow's extensive collection of pathological specimens.

The world's first motorway was used as a racetrack until the late 1990s.

You've probably seen these distinctive orange-tiled columns on the big screen.

The oldest statue in the Netherlands has survived relocation, bombardment, and burial.

The largest flower auction house in the world.

A local train station entrance hall doubles as a sanctuary for barn swallows.

This is Britain's one and only clock concealed in the pavement.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

A bookstore dedicated to the intersection of comedy and art.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

Gaze upon chocolate sculptures depicting everything from chariot races to Gaudí's famous church at this shrine to sweets.