In an Adventure Show special, Cameron McNeish explores our deep-seated passion for walking, something that stretches back through the centuries. It's an important part of our social history and is embedded in the Scottish psyche. And, as Cameron discovers, its something that attracts all kinds of people - from outdoor veterans such as trail-hardened Chris Townsend, who are out for months at a time, to Sam Heughan, star of the cult television series Outlander.