The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Public access to clean drinking water was an instant hit among the masses.

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

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

Ship-sized kinetic sculptural fantasy.

Lovers proclaim their unbreakable bond by leaving their names on locks fastened onto the Shoreditch fence in East London.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

This long-hidden space above Westminster Abbey now displays the battle gear of the legendary King Henry V.

The monster at the center of the Darwin Center Spirit Collection.

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

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

A closed London rail station created to cart away the dead still bears the marks of attempts to make it less morbid.

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

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

This beautiful Victorian ironwork masterpiece was built to keep London from smelling like poop.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

A hands-off space for graffiti artists to hone and display their skills.

Catacombs turned marketplace.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A cluttered and astounding collection of antiquities and curiosities.

The final resting place to 300 Victorian-era pets hides inside the city park.