Folklore says this medieval fortress was plopped atop a portal to hell to trap the demons below.

High in the mountains of Kochi Prefecture, a magnificent library designed by a world-famous architect.

An early life spent in this "Old Kentucky Home" inspired the writings of North Carolina's most famous novelist.

Some of England's last cave dwellers lived and worked within this huge cave.

This 13th century castle is chock full of ghosts and impossibly rare cows.

This medieval manor house was hastily fortified when it found itself in the middle of the Scottish fight for independence.

England's largest white horse isn't even white.

Seat of the Duke and Duchess of Devonshire for centuries.

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

Quaint, disturbing, and macabre objects are all on display at this intriguing collection of medical instruments from bygone eras.

Detailed sandstone carvings show an array of symbolism and adorable animals.

Britain’s longest ancient monument, this great 8th century earthwork was built to mark the boundary between what would become England and Wales.

The largest known medieval map of the world.

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

Puzzles within puzzles hide a golden treasure in this hedge maze.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

One of Europe's oldest libraries.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

This Gothic Revival castle used as a shooting location for "The Secret Garden" and other films.

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

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.