A ruined castle has more than its fair share of legends and ghost stories.

A historic holy well hidden near a charming English park.

One could not be blamed for literally walking all over this supposed landmark.

Two women with a flair for both adventure and artful clutter created this singular round home.

Famously misunderstood wonder of the ancient world

Ancient human remains unearthed around the iconic monument.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

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

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

This pump on the bad side of Victorian London betrayed a horrifying revelation about the water supply.

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

A mysterious pair of mice eating a piece of cheese is London's smallest public sculpture.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

The 2,000-year-old beam is tucked within the pedestrian entrance to the old London Bridge.

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

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

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

London's amazing modernist public square that never was.

Rebuilt remains of a temple to Roman god Mithras.

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

The commemorative stone column conceals a secret laboratory.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

This foreboding medieval castle was twice besieged by barons rebelling against the English king.