Scattered throughout Western Europe are the enigmatic monumental remains of the Neolithic and Bronze Ages. The most famous of these is undoubtedly Stonehenge in the south of England, however, thousands of burial cairns, stone circles, standing stones and rock carvings are found in other parts of the British Isles. For the past 30 years I have been surveying these monuments in Scotland to try and understand what their solar and lunar orientations might have meant in the beliefs of our ancient ancestors.