Scattered throughout London are ancient remnants of the city's former bounding wall.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

London's smallest police station is barely the size of a phone booth.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

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

A network of bells in the pubs and restaurants around Westminster alerts politicians when it's time to cast their votes.

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

Famously misunderstood wonder of the ancient world

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Dedicated to this region's early settlements and rich history of salt mining.

Bizarrely-painted church designed by a controversial artist.

At this exhibit on the world of poison, venomous animals steal the show.

Physicist’s epitaph provides final confirmation to a career of turmoil.

The first modernist church in Europe.

This museum is dedicated to the little known ancient Roman history of Vienna.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Located right outside of Vienna, visitors can take in expansive views of an ethereal forest.

The final resting place for the remains of 143 Habsburg royalty.

The taxidermy remains of the first brown bear to enter Germany in 170 years.

This tribute to the 16th-century composer is now an unusual shrine to Michael Jackson.

The R&B singer's modest church guarantees a religious experience, regardless of your beliefs.