An underground city of salt.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

80 years of the Battle of Peasholm on a small English lake.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

A sculpture serving as an homage to Pope John Paul II.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

Created as a punny statement about genetic engineering this monstrous hybrid statue has become a beloved icon.

An extraordinary collection of scientific instruments - and Einstein's chalkboard - inside the world's oldest purpose built museum building.

Humble beginnings for one of the world's most famous scientists.

A musical instrument played by the sea.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

A former steam-powered mill from the 1800s is now an industrial park with a giant steel dragon slide.

The Bristol Camera Obscura housed in an ancient windmill.