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

19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

The Tudor-style cottage in the middle of the square is not quite what it seems.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Formerly known as Saville Theatre, this mid-20th-century entertainment hub includes an ornate frieze.

The bar where "The Great Train Robbery" was planned was once a nexus of high society and low morals.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

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

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This five-star hotel was originally a swanky parking garage.

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

London's last remaining public soapbox site has seen speeches from Karl Marx, Vladmir Lenin, and George Orwell.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

The western face was supposedly left clock-less to snub the Welsh.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

A 168-foot tower, part of the abandoned Chester Leadworks facility.

The second-longest pier in the U.K. stretches a whole kilometer into the Irish Sea.

Much of what constituted mid-century Liverpool now litters a beach outside of town.

A hundred copies of Antony Gormley's naked body stare out across the water.

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