Secret refuge and museum of the Duke of Florence.

The middle finger of modernity.

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

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

Legend says this sacred tree was a gift from goddess Athena.

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

An incarceration museum on the spot of possibly the oldest prison in England.

A hands-off space for graffiti artists to hone and display their skills.

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

This ossuary is more than five centuries old and is heralded as one of the finest in Switzerland.

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

Standing stones found on a construction site are re-erected.

The oldest surviving wooden bridge over Rhine lets travelers cross easily from Switzerland to Liechtensten.

The excellent Swiss museum of witchcraft is led by a modern witch.

An unusual vending machine designed to support mourners during funeral ceremonies at Zurich's largest cemetery.

Large Hadron Collider and the Birthplace of World Wide Web.

A Milanese café entirely designed by the American director Wes Anderson.

A brutalist gem towering over the heart of Milan.

This poignant art installation raises awareness of violence against women.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

This statue of a Hindu cosmic dancer at CERN is a metaphor for modern physics.

Florentine Renaissance style building in Switzerland, home to the world's largest taxidermy Great White Shark.

This small museum displays a collection of outsider art and scale models of past "treatments" for mental illness.

Walk through a restaurant's refrigerator door to reach this hidden bar.