The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

The largest greenhouse in the world is home to over one million types of plants.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

The quaint little store that is said to have inspired a famous Dickens novel was only given its name after the book was released.

A fantastic castle rumored to be the birthplace of King Arthur.

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

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

The atmospheric road was never meant to be so creepy.

Northern Ireland's Brobdingnagian stepping stones.

Famously misunderstood wonder of the ancient world

The sign at the garden gate reads: "These Plants Can Kill."

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Putting the "mod" in "modular" since 2000.

This South London cemetery holds the remains of more than 15,000 people.

London's smallest police station is barely the size of a phone booth.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

A student driver's nightmare.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A portly statue of a golden boy commemorates an unusual cause of the Great Fire of London: the sin of gluttony.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

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

A kaleidoscopic warehouse-maze of handmade neon signs.