An existential riddle in the world's largest ancient castle.

An abandoned quarry hides an open-air gallery of huge sculptures, some made from the rubble of 9/11.

This ancient rock painting is the oldest evidence of humans’ love affair with honey.

Ancient Greek oracle of the dead.

The ruins of this monumental city founded by the first Roman Emperor are strangely overlooked by most travelers.

This Norman castle was once the site of a Victorian-era prison, and now exists as a luxury hotel.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

A beautiful medieval bridge allegedly constructed by the Devil.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

This impressive former palace contains a hidden gem for fans of modern sculpture.

The ghost town that was one of New Hampshire's first settlements now exists as a park detailing its history.

A 12,000-year-old bog boasting rare plants and fauna.

This historic mini-suspension bridge was swept away once but is now here to stay.

The small sanctuaries lie just off the beaten path near one of Bhutan's most famous attractions.

World's most expensive home.

A 66-million-year-old rock formation stands tall over Mumbai, offering stellar city views.

After being destroyed by two separate fires, this monastery is now home to a small zoo and relics from dozens of saints.

The original movie set for the home of 'Star Wars' hero Luke Skywalker.

An abandoned film set location for a remote spaceport in a galaxy far, far away hides in the Tunisian desert.

A seemingly simple canyon that was the backdrop to a number of famous movies.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

Too much gossip or just missing curfew could land you in here for a couple of days.