From Peru’s ancient citadels to France’s mysterious standing stones, there’s an abundance of prehistoric sites that pre-date 2500 BC, when Stonehenge’s legendary stones were put into place. They include megalithic monuments, hunter-gatherer villages and thriving port towns. We dig beneath the surface to reveal the sites around the world that are older than Stonehenge, from newest to oldest, including the recent 'Spanish Stonehenge' that has emerged from the Valdecañas Reservoir.