There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

England's steepest street has such a drastic incline that locals tie their parked cars to lampposts when it gets icy.

Where condemned pirates met their grisly end at the gallows on the River Thames.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

The fences outside some of South London's estates are made from recycled World War II stretchers.

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

One of the greatest movie directors of all time lived and worked in this London flat from 1926 to 1939.

The "shampooer of kings" who opened London's first curry cafe was a celebrity in the 19th century, but is all but forgotten now.

A unique tribute to the millions of animals who served and died for the British military.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

This secluded walkway overlooks a magnificently wild London green space.

The secret wartime bunker built on the platforms of an abandoned Tube station.

This overlooked street light once served as a KGB dead letter box.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

This one has sailed five times as far as Sir Francis Drake's famous ship.

A network of concealed passageways lies within a busy London Underground station.

The childhood home of Earth's alien chameleon is a humble Brixton flat.

A friendly pub with a sordid past in cock fighting.

A glorious pub known for a spiteful printing feud and its famous typeface lost—then found—at the bottom of the Thames.

This hidden green space is the city's second largest conservatory.

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

An artistic tribute to the famous singer, just around the corner from where he was born.

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