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

A deer-headed statue that brings together a 12th-century legend and big wave surfing.

Explore a remarkable 35-hectare sculpture garden located an hour outside of Lisbon.

360° views of the city plus five floors of optical illusions and hands-on science.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th-century artistocrat's mansion, turned into a library, hidden in a modern library.

Where visitors can play more than 150 retro arcade games.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Beneath Kraków Old Town's main square lies a hologram-filled medieval market vampire graveyard wonderland.

Learn the fine art of making a centuries-old treat at this hands-on food museum.

A magnificent collection of imperial armor and weaponry.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

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

The site is dedicated to an investigative journalist whose murder triggered a political uproar that changed Slovakia forever.

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

An underground city of salt.

A fortress off the West coast of Portugal that dates back to 1502.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A haunting collection of the vanished and disappearing natural world.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This museum documents the ancient practice of salt production in Figueira da Foz.

This enigmatic Roman tower lurks just outside Belmonte.

This museum is home to one of the biggest collections of printing press technology—plus a river view.