The Royal Observatory, Greenwich, London founded in 1675. The site of the Prime Meridian as well as the origin of Greenwich Mean Time, now the Observatory's historic buildings house a museum of astronomy, navigation and timekeeping as well as the Weller Galleries of modern astronomy and the award winning Peter Harrison Planetarium.
Silbury Hill, Avebury. The largest man-made mound in Europe, mysterious Silbury Hill compares in height and volume to the roughly contemporary Egyptian pyramids. Probably completed in around 2400 BC, it apparently contains no burial. Though clearly important in itself, its purpose and significance remain unknown. There is no access to the hill itself. Distance from Shaftesbury to Avebury is 42 miles More