The world's largest collection of preserved trolleybuses.

One of the shortest streets in York has an especially odd name.

Three small rooms at the back of the “official” church of London's clowns.

This tiny 1930s Art Deco airport is a beautiful remnant of a bygone era.

This surreal art house looks like a geometric version of a small chapel.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The world's oldest surviving music hall was also once a freakshow.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Museum celebrating the history of computers, especially their role in codebreaking.

Long abandoned underground complex to keep royals safe from a nuclear war that never came.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

One family's environment-friendly hobbit-house in Wales.

A curious collection of mechanical moving figures.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

Charles Babbage's proto-computer, painstakingly brought to life.

Traveling collection of amazing automata.

This foolish Victorian sea fort was converted to a deluxe hotel.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

A historic London pub with prison cells in the cellar and a "spy room" on the second floor.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.