The world's second-largest sundial, made entirely out of stone.

Famously misunderstood wonder of the ancient world

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Once the most densely populated place in the world, this island is now a ghost town.

Try not to get slimed in Tribeca.

Beyond being incredibly fun, not much can be said about the Hole with certitude.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

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

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.

The fairy tale castle of the "fairy-tale king."

An ancient capital city that dates back 3,000 years old and harbors many surprises.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

These picturesque ruins crumble beautifully into the ocean.

This remote castle was built to be a wealthy businessman's palace of vice but is now simply a historic vacation cottage.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

This antique prison is a tourist attraction with a sordid past.

The largest greenhouse in the world is home to over one million types of plants.

This legendary city has been a tourist attraction for centuries.