What started as a way to address damp basement walls turned into a house filled with intricate hand-carved designs.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

A Roman spa buried deep beneath the City of London.

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.

The Great Fire of London and the regulation of one-way streets both started in this alley.

The commemorative stone column conceals a secret laboratory.

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

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

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

Giant, friendly pelicans in Central London, the most unlikely of places.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

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

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

The remains of Crystal Palace Great Exhibition of 1851.

This 1920s Dutch barge is now a floating bookstore.

A cluttered and astounding collection of antiquities and curiosities.

A historic house left in "dramatic still life."

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

Rebuilt remains of a temple to Roman god Mithras.

An unusual round church in London with a Templar past.

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

A tongue-in-cheek arcade where the games are based on everyday life.