The longest and tallest aqueduct in Britain can actually be sailed across.

These haunting ruins belong to an ancient village that once had one hell of a view.

This lonely cast-iron structure is the only wave-washed lighthouse of its kind left in all of Britain.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

One family's environment-friendly hobbit-house in Wales.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

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

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

Three bridges straddle a stream, one stacked upon the other.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

The decaying ruins of Wales' first asylum for the mentally ill.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.

A subterranean playground in an abandoned slate mine.

These unknown Bronze Age earthworks are believed to be ancient burial mounds.

This Victorian-era walkway is just one of the many 19th-century treasures in Whitehead.

These sculptures honor the knights who once called Carrickfergus Castle their stronghold.

This massive basalt sea stack stands obtrusively from the rocky coastline.

Whimsical woolen creatures have taken over this historic Northern Ireland park.

One of the largest lenses of its kind ever created, this former ship beacon has been brought down to Earth.

A museum dedicated to the tragedy of Bloody Sunday.

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

The last Victorian market in Belfast.

Legend says the water within these mysterious sacred springs stays cold even when boiled.

A beloved upside-down beacon off the coast of Northern Ireland.