Long-secret natural history museum, featuring the skull of a "Terror Bird."

This crumbling folly looks like an enchanted left over from Middle Earth.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

Built by the patron saint of illusionists this Elizabethan manor house is riddled with secret cubbies for hiding priests.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

Seat of the Duke and Duchess of Devonshire for centuries.

This mysterious underground cave in Shropshire dates back to the 18th or 19th century.

The intended purpose of this unfinished Elizabethan building remains a mystery.

Isaac Newton's former home, where the famous apple tree still stands.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

One of the oldest libraries in England, and one of the last of the great medieval chained collections.

This English medieval castle is where King John died of dysentery.

The undercroft is a spectacular example of medieval Cistercian architecture.

The ancestral home of beloved English poet Lord Byron has a bizarre history.

Hundreds of huge, centuries-old horseshoes adorn the walls of this nontraditional 12th-century castle.

This ruined medieval castle was the scene of Lord Robert Dudley’s seductive reception for Queen Elizabeth I.

This ornate English estates "Prodigy House" still bears the cannonball marks of civil war.

This 2,000-year-old tree inspired the nursery rhyme "Rock-a-bye Baby."

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

A labyrinthine underworld of tunnels and caverns hides beneath the city.

A striking 500-year-old mansion provides an unexpectedly sublime home for live deer and a menagerie of exotic stuffed animals.

Left by the Devil, an ancient quarry or just plain old erosion, this enigmatic rock pillar rises 28 feet from the hillside.

This home of a taxidermy hoarder is among the grandest and most singular of historic English estates.