Scotland’s first settlers arrived over 10,000 years ago, and even today there are incredible monuments to the peoples of long ago. Burial cairns, brochs, hut circles and other remains are abundant across much of the mainland and islands, but it is standing stones that perhaps draw the strongest reactions from visitors. For standing stones and circles the mystery is often around their purpose – something that has been subject to speculation by archaeologists for many years. Here’s a few of Scotland’s finest: Callanish, Isle of Lewis One of the most spectacular and celebrated monuments in the country, Callanish – set…