Neolithic site of Silbury Hill, Tilshead, Wiltshire, England

The hill that remembers. International Archaeology Day

Each year, International Archaeology Day—observed on the third Saturday of October—invites us to literally look beneath the surface. Established in 2011 by the Archaeological Institute of America (AIA), it's celebrated worldwide through events, tours and hands-on excavations.

Some sites, like the one shown here, blend seamlessly into their surroundings: at first glance, Silbury Hill in Wiltshire, England, may seem like a simple slope in the countryside. However, it conceals a 4,500-year-old Neolithic enigma. Starting around 2400 BCE, chalk was locally quarried, transported and compacted by hand, layer by layer, over generations. The result is the tallest prehistoric mound in Europe, built entirely by human effort, rising to about 40 metres.

Was it a ceremonial site, a cosmic marker, a symbol of community? Its original purpose remains elusive, and for archaeology, the questions can be as valuable as the answers. Where written records fail, the land tells its story. Silbury Hill preserves these tales, reminding us why studying our past matters: it rewrites what we thought we knew, amplifies silenced voices and shows us that history is never finished.