A few stone foundations and an old graveyard are all that is left of this once thriving settlement in the wilds of Connecticut.

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

Be careful not to get trampled at this lively two thousand-year-old market.

Constantly maintained, this organ is playing a six-century long composition by John Cage.

Cold storage for agricultural biodiversity.

The true jewel of Africa's west coast known as "Africa's Last Eden."

The world's first and only natural nuclear reactor.

The "Versailles of the Jungle" built by a dictator is now a decaying shadow of its hubristic grandeur.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

Walk through living pictures and music in the Cathedral of Images.

An isolated village literally built into the crevices and rock formations of a mountain.

Wonderland replication in progress by one persistent man.

This fantastical and eclectic English garden takes its inspiration from Egypt, China, the occult and more.

This long-distance walking route follows the Prime Meridian line as it passes through England.

A Scottish manor with a history of mysterious fires, magic, and eccentric tales

This shell of a historic manor house on the Isle of Wight is said to be the most haunted site on the island.

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

Overlooking a Scottish loch, this beautifully crumbling castle once inspired a poem by William Wordsworth.

A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Ruined castle with subterranean vaulted Goblin Ha' or "Goblin Hall."

The stately remains of Llywelyn the Great's mighty fortress.

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

Once thought to be the mysterious work of a witchy prophetess, a well with unusual properties turns objects into "stone".

The hidden "ballroom" under a mansion lake was built by a criminal who ate a cyanide pill during his trial.