Almost everyone has heard of the Great Egyptian Pyramids of Giza, the oldest-known of which was built around 2600 BC; most people in the West have heard of England’s Stonehenge, believed to have been constructed somewhere between 3000 BC to 2000 BC; and some may even have heard of Newgrange in Ireland (Sí an Bhrú in Irish), a grand passage tomb built around 3200 BC. But very few people know about Central Europe’s ‘roundels’ – Neolithic circular enclosures, the construction of which between 4600 – 4900 BC makes them far older than all of the more famous prehistoric sites mentioned above. Radio Prague International spoke to archaeologist Jaroslav Řídký about these ancient structures.