This 19th-century island fort built to protect against an invasion by sea.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

The remains of a small medieval chapel mark the legendary birthplace of the patron saint of Wales.

Go deep down into the earth to experience the world of Welsh coal miners.

The only medieval bridge in Britain with its defensive tower still in tact.

The largest of only eight working transporter bridges left in the world.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

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

After years of slow decline, a derelict Gothic castle is now being restored to life.

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

The remains of centuries of copper mining appear like an alien landscape.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

A spiral staircase connects the limestone cave with Pembroke Castle, birthplace of King Henry VII.

A real-life Professor Snape once taught in this Welsh university building, which students of course nicknamed “Hogwarts.”

Picturesque ruins once held off mighty armies.

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

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

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.

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

The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.