This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

In Twickenham sits a small whitewashed castle that inspired Mary Shelley's 'Frankenstein.'

This romantic, decaying 13th-century ruin on the edge of Sherwood Forest is reputedly one of England's most haunted places.

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

Fantastically decorated underground chambers built in the 1760s.

Follow the original medieval paths that wind through this intriguing section of the city.

A open air theatre built on a cliff by an eccentric British woman.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

This foolish Victorian sea fort was converted to a deluxe hotel.

The oldest inn in England served brew to the crusaders.

The names Lúthien and Beren can be found inscribed on the shared grave of the famous writer and his beloved wife and muse.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

This tangled English forest looks like something right out of a fairytale.

The world's largest collection of witchcraft regalia.

A boulder in the Churchyard of Down Cathedral marks the legendary burial place of "The Apostle of Ireland."

A former watering trough turned local heritage site.

Celebrated in poem, this tiny hidden cemetery has a big and grisly history.

The last Victorian market in Belfast.

This picturesque lighthouse at the edge of the Irish Sea looks like a giant stone pencil.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.