Eighty million natural history specimens call this gargantuan museum home.

England's oldest surviving hedge maze has been confusing visitors for over 300 years.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

This smily stone feline is meant to represent a mythical lion that almost destroyed the island of Kea.

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

One part local history, 99 parts gruesome haunted house.

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

Hideout of thieves, monks, and goat-footed gods.

What once sat in the world’s spotlight is today a largely disused ghost complex.

Large collection from the 3rd millennium BCE.

Where commuters walk through remnants of an ancient Greek necropolis.

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

360° views of the city plus five floors of optical illusions and hands-on science.

The final resting place of soldiers' loyal canine companions.

Monasteries on rock pillars, once accessible only by frayed ropes.

The hallucinogenic center of the ancient world.

Largest lake in Great Britain measured by surface area.

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

One of Ireland's most infamous prisons for rebels including men, women and children.

Europe's largest prehistoric mound – burial site of a legendary king?

Famously misunderstood wonder of the ancient world

The largest stone circle in the world has ended up bringing up more questions than it has answered.

This open air archeological site houses almost as much wildlife as it does classical religious artifacts.