At low tide each day, near Vauxhall Bridge in London, the Thames reveals the tops of a mysterious group of prehistoric timbers buried on the shore in central London.

The team investigate Roman remains that are unearthed in Ancaster: a huge town wall and a pagan temple.

A beautiful jar found at Kinlochbervie leads the team to wonder if a wrecked ship could have belonged to the Spanish Armada.

The team are invited to the Military Intelligence base at Chicksands to explore its controversial site history, a 13th century unisex monastery.

The team dig up a pub car park near Ironbridge Gorge in Shropshire and find the remains of a 17th century blast furnace for smelting iron.

The team assess a wealth of Roman artefacts unearthed by amateurs in Cheshnut, Hertfordshire, but there are no obvious buildings. The major Roman highway, Ermine Street, is somewhere close by but its actual location is a mystery.