The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

Eighty million natural history specimens call this gargantuan museum home.

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

Scattered throughout London are ancient remnants of the city's former bounding wall.

An incarceration museum on the spot of possibly the oldest prison in England.

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

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

A historic house left in "dramatic still life."

A cluttered and astounding collection of antiquities and curiosities.

A student driver's nightmare.

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

An alleyway plaque is all that remains of the independent Texas' envoy that forgot to pay their rent for over a century.

Rebuilt remains of a temple to Roman god Mithras.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

An unusual round church in London with a Templar past.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

This South London cemetery holds the remains of more than 15,000 people.