This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Dug as a secret royal escape route, the tunnel became a wartime bomb shelter and dumping ground for vintage cars.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

These "anatomical machines" are only one of the many strange items in this Italian crypt.

Ancient ruins hidden underneath a modern luxury hotel.

A hospital where antique dolls are given new life.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

An abandoned 18th century manse looks like something out of an Indiana Jones movie.

Astonishing rock formations dot the Brimham Moor landscape.

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

This crumbling folly looks like an enchanted left over from Middle Earth.

This fantastical and eclectic English garden takes its inspiration from Egypt, China, the occult and more.

A stone obelisk towering over the surrounding countrysides beckons hikers across the rolling moors.

The ancestral home of beloved English poet Lord Byron has a bizarre history.

A collection of early 19th century trams set in a reconstructed period village.

This centuries-old canal known as the Cuckoo Dyke has a staircase of locks suitable for a giant.

A gorge full of caverns where early humans lived alongside cave hyenas, giant mammoths and wooly rhinoceroses.

A poignant memorial to the 106 coal miners killed in three major accidents in Derbyshire.

6000-year-old site covered in more than 50 megaliths.

This lovely ancestral home inspired the author D.H. Lawrence, and features a tunnel made out of a living willow.

There's a strange stone hoodoo towering atop a wooded hillside and no one is quite sure how it got there.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.