Black cat statues guard this temple-like Egyptian revival factory.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A naturally mummified 2,000-year-old man.

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

This magnificently macabre shield shows the power of chivalrous love in medieval times.

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

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

A famous burial ground with a history both grim and literary.

Murals of the wild parties once held on the frozen River Thames.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

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

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

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

The plunge pool is a surviving relic of a rowdy royal residence.

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

An architectural oddity hides in plain sight on this iconic London bridge.

A quiet memorial to those who died saving others in the heart of the City of London.

The remains of an ancient Roman teenager are memorialized at the base of a modern London landmark.

A Roman spa buried deep beneath the City of London.

These Victorian era devil sculptures were designed to spite a local vicar.

This may be the last of London's wooden pavements, which were once a common sight in the city.

London's amazing modernist public square that never was.

The last four extravagant street signs of London's historic banking street.