The remarkable boom and bust story of Gilbern, Wales' pioneering motor company, and the army of fans keeping its vintage cars on the road.

Episode Four explores a unique corner of Cardiff that was reduced to rubble, the nature reserve with an explosive past and the seaside railway that made history.

Episode Three explores the mining village that's missing from our hillsides, the watchmaking factory that ran like clockwork, and the atmospheric ruins of an industrial powerhouse.

Plus, the iconic sports stadium where history was made.

Episode Two explores the much missed Merthyr Triangle, the seaside town that made transport history and the unique building that was the pride of Tiger Bay.

Plus, the iconic factory that inspired the Sydney Opera House.

Episode One explores the lost village of the Valleys, a hidden ruin from the 1920s, and a housing complex with a fascinating past.

Plus, the iconic music venue with a unique link to Jimi Hendrix.