In this programme, Paul travels from Britain's most westerly mainland point to a place once guarded by an ancient Celtic goddess. On the way he discovers how the ancient oak woods of Loch Sunart were once a hive of industry, and then goes deep underground to discover how 18th century miners named a new element. On the shores of Loch Linnhe, he meets the owner of a castle and recreates a scene from Monty Python's Holy Grail before ending his Grand Tour from the heights of the pap of Glencoe.

In this episode Paul heads to one of Britain's remotest railway station. Miles from any road, it was built to service several grand sporting lodges in the days when the rich and fashionable came to shoot game and fish the lochs of the Flow Country. Heading into the wilderness, Paul discovers a legacy of habitation before the highland clearances, and how early industrial plans to exploit the vast reserves of peat would have destroyed an eco-system which is now valued throughout the world for its wild beauty. Paul then pans for gold in an icy river before heading for a miracle cure at The Lourdes of the North - the tiny and deserted Loch ma Naire. Journey's end is on the sands of the Kyle of Tongue where Paul learns about a consignment of Jacobite gold that could have changed history.

On this Grand Tour, Paul discovers the strategic wartime importance of Loch Ryan, and meets a man whose memory of those days is tinged with tragedy. In Stranraer, Paul discovers a legacy of Arctic exploration and an old can of bully beef, then meets a clan chief who tends a unique garden surrounded by two lochs. Reliving the days of steam trains, Paul walks the old railway line towards Loch Ken where a monster lurks beneath the waters. On the banks of Loch Trool, he discovers some rocky evidence of Bruce's victory over the English in 1307, and then climbs the highest mountain south of Ben Lomond: the mighty Merrick.

In the final episode of the series Paul visits Kintyre and encounters a strange and spiritual cave painting on Davaar Island before sampling spirits of another kind in Campbeltown, famous the world over for whisky. This leads him to uncover the story of the only coal mine in the highlands and a seam that runs all the way to Ireland. Heading up Loch Fyne, Paul joins the last of the Ring Net fishermen onboard a restored fishing boat heading to Lochgilphead where he tracks down the inventor of Scotland's lost supercar - the Argyll Turbo. Journey's end is in the middle of Loch Fyne on a truly remarkable relic of the ice age.

Paul visits Wester Ross and discovers the heritage of Little Loch Broom. He then travels to the off-grid community of Scoraig where he learns about violin making and wind power, before taking the plunge to explore the hidden depths of the Corrieshalloch Gorge.

Paul explores the lochs of Skye. He hears tales of the singer Donovan and his dream of a hippy colony; thrills at the sound of the pipes, tries on a jacket fit for a king, and goes in search of a Viking ship canal. After learning about the mythical female Celtic warrior and sorceress Scáthach, Paul has a lesson in spear throwing, before tackling one of the longest rock climbs in the Cuillin Mountains - the Dubhs Ridge. Journey's end is one of the finest mountain views in Scotland.

This Grand Tour starts at Loch Glashan above Loch Fyne, where Paul travels back in time to learn how to paddle a coracle. At Old Castle Lachlan, he dabbles in Victorian virtual reality, courtesy of George Washington Wilson and his stereoscopic camera. At the open-air museum of Auchindrain, Paul follows Queen Victoria on the trail of poverty tourism, before having fun with the tale of MacPhunn - a man who cheated the noose.

Leaving Kinlochleven - once known as the electric village because of its links to power-hungry aluminium smelting - Paul discovers a forgotten German PoW camp from WWI in the woods nearby. Taking an old military road out of the village, Paul climbs into the surrounding hills and arrives at the Blackwater dam - a colossal memorial in concrete to the last of the navvies. After visiting the graves of some who died during its construction, Paul treks across empty moorland to a lonely bothy.

From a mythic past, when kelpies lurked in the lochs of the Trossachs, Paul travels through old Perthshire. He lends a hand bringing in the cattle and hears how Rob Roy MacGregor might not have been the romantic figure of popular fiction. Was he a hero or just a cattle thief? At Rob Roy's graveside, Paul meets a man who casts doubts on the clansman's last resting place.

Paul's loch-hopping journey starts on the west coast, on a wild and windswept stretch of Loch Hourn. Travelling inland, he reaches sheltered Loch Quoich, where he hears tales of Scotland's last outlaw. On the shores of Loch Lochy, he meets a couple who had a memorable encounter with a monster from the deep called Lizzie. A detour south leads to a ruined bridge where the first shots were fired of the '45, and Paul then walks an old railway line above the Great Glen, and inhales diesel smoke.

Paul explores the forgotten lands of Morvern. On the shores of Loch Aline, he sees the devil in a fossil and then plunges deep underground to discover an unlikely connection between sand and WW2. Above Loch Arienas, he hears the moving testimony of a family who were cleared from the land in the 19th century. Paul then has an al fresco art lesson and tries to paint the scene. At Fort William, he paces the ruins of the original fort.