Catacombs turned marketplace.

The medieval woodcut-style artwork chronicles life in medieval London.

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

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

A mysterious shape catches the eye in this 16th-century painting.

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

A giant scrawl on the skyline of south London.

A living memorial to the trees London lost during the Great Storm of 1987.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

The bronze uniforms commemorate the vital role of women during World War II.

This ancient Egyptian obelisk still bears the wounds of World War I.

London's amazing modernist public square that never was.

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

Classic game cookery takes center stage at what's widely considered London's oldest restaurant.

Since 1887, this old-school shop has stacked its shelves with extraordinary coffees and teas.

Originally built for London’s cab drivers, this bright green hut now serves anyone a hot drink or meal.

The broken skateboards that became a poignant memorial to a murdered skater.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

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

This luxury shopping lane has been protected by its own tiny police force for over a century.

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

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

This London plaque marks the spot where David Bowie's famous alien made his debut.

Remnants of cells from the most notorious London prison may lie in the basement of a rare Victorian Gin Palace.