Scotland's Isle of Lewis is steeped in history [audio 25min]

In "Past Lives", Mark Stephen sets out across Scotland to answer your historical questions. Mark is back for a new series on the intriguing tales from Scotland’s past. He sets out across Scotland to answer your questions about the country's past -- from Wick to Dumfries and Vikings to Mods, his curiosity knows no bounds. This week, Mark sets off for the Isle of Lewis.