Silbury Hill

Dating back to around 2400 BC, it ranks among Europe's largest man-made mounds. You can't climb to the summit these days, but walking around its base really brings home the immense scale and the sheer effort involved in building it without modern machinery. The site forms part of the wider Avebury World Heritage Site, making it an excellent addition to a broader visit that includes the standing stones at Avebury and West Kennet Long Barrow nearby. What it was actually for remains genuinely mysterious—theories range from a burial site to a territorial marker or ritual centre, but nobody knows for certain. The hill itself is far older than the Roman period, though the region has plenty of Roman history elsewhere. Getting there is straightforward via the A4 road, with parking available on site. The village of Avebury is a short walk away if you want refreshments or to explore further, and the market town of Marlborough makes a convenient base if you're spending longer in the area.