An underground city of salt.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

This picturesque castle in Poland has a rich history, including a legend that ties it to lost Incan treasures.

This tower in a small Polish village uses the power of a sacred bell to ward off mischievous weather spirits.

This imposing 20th-century castle was abandoned before it was ever completed.

Boats must transform into railroad cars to navigate this Polish canal.

A World War II torpedo launch station abandoned off the Polish coast.

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

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

One of the largest mechanical models of the solar system in the world.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Chester Cathedral is home to a unique painting crafted on a canvas of cobwebs.

This Cheshire museum has cuckoo clocks, a rare pipe organ and vintage motorbikes. But mostly cuckoo clocks.

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

A tongue-in-cheek arcade where the games are based on everyday life.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

A cluttered and astounding collection of antiquities and curiosities.

Tucked inside a South Bank bar is an epic expressionist chronicle of the 20th century.

A collection of machines designed to break things for science.

A friendly pub with a sordid past in cock fighting.

One of the world's largest collections of pathological specimens.

This pub boasts a curious history and may have inspired a Dickens character.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.