Clava Cairns South-West Cairn completes the sophisticated astronomical alignment system that makes this Bronze Age site one of Scotland's most remarkable prehistoric monuments and the perfect inspiration for Outlander's mystical stone circle. This passage grave mirrors the northeast cairn's construction and astronomical orientation, creating a unified ceremonial axis that demonstrates ancient Highland communities' advanced understanding of seasonal cycles and solar movement. The cairn's entrance passage also points toward the midwinter sunset, and its kerbstones display the same deliberate color grading from larger, redder stones facing sunset to smaller, white quartz-crystal stones facing sunrise. This coordinated design across both burial chambers shows remarkable planning and execution that required sophisticated knowledge of astronomy, engineering, and spiritual symbolism. The South-West Cairn's contribution to the site's overall mystical atmosphere and astronomical function demonstrates the depth of Highland spiritual tradition that continues to inspire contemporary appreciation for Scottish heritage and mystical connections across time.