The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

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

The celebrated eyesore created by starry-eyed sweethearts.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

An ancient necropolis of magnificent tombs.

A rare example of a medieval house in Rome adorned with a melancholic inscription.

A cone-shaped top and cylindrical body set this 900-year-old structure apart from other Italian bell towers.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

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

2300-year-old Roman road connecting the empire.

Romania's only crater lake with water as pure as if distilled.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This enormous censer uses a pulley system installed over 400 years ago.

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

An underground city of salt.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

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

An otherworldly alpine pasture with its own unique microculture that recalls Middle Earth.

This one-time health resort was used by aristocrats around the world.

Heralded as one of the prettiest castles in all of Czechia.

This strange statue depicts a young boy's body with an adult Mozart's head and a single wing.

A mesmerizing landscape of 18th-century cellars carved out of the land.