Huw Edwards and the history detectives discover a lost church (Tal-y-Cafn), search for the oldest castle (Hay-on-Wye) gate in Europe and find out how the great engineer Thomas Telford built the highest aqueduct (Pont Cysyllte) in the UK.

Huw Edwards and his team decipher the writing on a stone pillar (Eliseg's Pillar), recreate what an iron age fort (Gaer-Fawr) would have looked like and uncover an 18th century copper works (Swansea).

This time, Huw Edwards and his team examine a Tudor house (Old Impton Farm), a Roman theatre (Tomen-y-Mur) and a chapel (Llanelli).

Huw Edwards and his team interpret the strange humps and bumps in the Welsh uplands (Pen-blaen-Milo). A model farm (Leighton Park Farm) and a medieval wall painting (Ciliau).

Huw Edwards investigates the case of the disappearing house near Llandeilo. WWII defences at Holyhead and searches for a lost castle at Portmeirion.

Huw Edwards narrates a look at Stonehenge's link to the Preseli Hills, Swansea's medieval beginnings and bomb-damaged streets, plus the secrets of the highest house (Gwylfa Hiraethog) in Wales.

A look at how laser scanning helped uncover the history of Vivian quarry in North Wales, the rediscovery of a medieval fish trap in Fishguard harbour and a visit to architect Herbert North's contribution to Llanfairfechan.

Discovering what may be a Roman villa near Trawsgoed in Mid Wales, uncovering the hidden secrets of a Renaissance ceiling at St David's Cathedral, and observing the preservation of a major sculpture at College Harlech.

A look at the house that time forgot near Raglan, and a visit to the World War I training trenches at Penally in Pembrokeshire. A look at the 18th century's largest copper mine (Parys Mountain).

A look at the legacy of a Tudor lord who wanted to turn Denbigh into the capital of North Wales. Pembrokeshire's Iron Age Forts. Strata Florida sheep farm.