Famously misunderstood wonder of the ancient world

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

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.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

This charming fountain honors Felix Salten, the creator of the iconic storybook deer.

The Swiss artist's bulbous and overgrown shape-shifting sculpture controversially graces the center of Bern.

The bears of Bern have been a city highlight for over 500 years.

One of a series of no-purpose kinetic artworks by Swiss sculptor Jean Tinguely.

This simple apartment may have inspired some of the most important theories in the history of science.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

A historic observatory precariously perched at the "Top of Europe."

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

Long tunnels run under the ancient chariot racing circuit to the tower.

This haunting location was featured in the final scene of a classic spaghetti western.

One of Antoni Gaudí's least-visited works, an homage to Catalan patrimony that mixes neo-Gothic with Modernista forms.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

A controversial art piece that harkens back to local folklore.

Occupied for six centuries by Franciscan Order nuns, this monastery is an amazing ode to Catalán Gothic architecture.