The Machrie Moor Stone Circles, located on the Isle of Arran in Scotland, consist of six stone circles surrounded by other prehistoric remains like standing stones and burial cairns. These circles were built using granite boulders and red sandstone pillars, with some circles positioned over previous timber circles. The most visually striking circle is Machrie Moor 2, featuring tall sandstone slabs and a central cist where a food vessel was found. The circles are strategically placed to align with the summer solstice sunrise, adding to their mysterious allure. Overall, these ancient structures offer a fascinating glimpse into the Neolithic and Early Bronze Age history of the area.