A plaque marks the underground site of one of London's "lost rivers."

A faded reminder of what was once a common sight in London during the Blitz.

This aluminum “stairway to heaven” has impaled at least a couple of birds.

A gallery specifically dedicated to the botanical illustrations of a remarkable traveling lady.

Eclectic final resting place of the controversial explorer.

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

This home on a quiet suburban street is completely covered with vibrant mosaics.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

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

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

Victorian-era Londoners really wanted to believe this 17th-century cistern was actually an ancient artifact.

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

A building that survived WWII, possibly on the virtue of its name alone.

The pretty iron lamp is a reminder of the architecture underneath London's streets.

Buried for centuries, this hidden cellar is all that remains of London's medieval Whitefriars Monastery.

An unusual round church in London with a Templar past.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

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

From the sky, a kaleidoscope of color brightens the grey landscape of the San Francisco Bay.

Golden Gate Park's historic collection of plants.