Will begins his tour in the north, uncovering long-unseen historical gems such as the biggest abandoned slate mine in the world.

Will visits mid-Wales and the west of the country and uncovers a lead mine that is thousands of years old.

In this final episode, Will completes his tour around Wales in the south of the country. From the resting place of early man to a lost mediaeval city, and from a forgotten prisoner of war camp to an abandoned coke works, Will uncovers historical gems that reveal parts of south Wales you never knew existed.