A fantastic castle rumored to be the birthplace of King Arthur.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The world's largest wooden structure.

Go inside to really appreciate this 500-year-old technological masterpiece.

Italian cave with exceptional acoustics and an unsavory history.

A little sculpture with a large wardrobe.

A giant bug impaled on a 75-foot-tall needle.

This cramped crevasse saw the entire population of its island suffocated inside its depths.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The legend says that this English rock formation was once a hunter who was turned to stone by annoyed witches.

Why have you never heard of the second most popular tourist site in New York?

Regency-era excess on the English Coast.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

The remains of Crystal Palace Great Exhibition of 1851.

Abstract dinosaur models in London.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

The largest known medieval map of the world.

Rare collection of medieval books under lock and key.

Famously misunderstood wonder of the ancient world

This one has sailed five times as far as Sir Francis Drake's famous ship.

One part local history, 99 parts gruesome haunted house.

Shiny Brutalist box commemorates a pioneer of electricity and houses a railway transformer.