This amazing 15th-century mural remained hidden in plain sight for centuries.

According to legend, this tomb holds the secrets to time travel.

The medieval legend behind this holy well was one of the inspirations behind "Alice's Adventures in Wonderland."

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

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

Legend says this rock was once a chopping block for public executions.

The main gates have been locked since 1745 and will remain so until the Stuart Dynasty returns to the throne.

A historic hill of tall tales, with one rather special tree.

A measuring mishap led to these artificial stone ladies losing their stomachs.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A tiny replica of the iconic London landmark hides on the side of the steel structure.

This small collection of rare books was uniquely locked up for safe keeping.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

Although it appears ancient and mysterious, the quirky folly was actually built 200 years ago by an eccentric estate owner.

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

England's most notorious suicide spot.

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

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

Protecting the dead from opportunistic body snatchers.

A house of bones — but nobody is quite sure to whom they belong.

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

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

This sculpture, residing in a quiet corner of a London park, honors the victims of 9/11.

This imprint of an old computer keyboard has a unique backstory.