These precariously placed ruins harken back to a 13th-century castle.

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

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

Quirky Welsh observatory unites art and science.

This 500-year-old Tudor home is a treasure trove of history and mystery.

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

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

One of the few surviving street funiculars in the world.

A 19th-century funicular railway shuttles visitors up this surprising sea cliff to one of the world's largest camera obscuras.

This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Picturesque ruins once held off mighty armies.

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

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

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

A wildlife paradise, this island is one of the world’s most important habitats for burrow nesting seabirds.

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

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

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

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

This Roman amphitheater is said to be King Arthur's legendary Round Table.

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

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

At the United Kingdom's only residential library you can sleep among the books.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.