14 Mysterious Landmarks That Science Still Can't Fully Explain

2. The Carnac Stones (Brittany, France): Europe's Vast Stone Alignments

Forget Stonehenge; the Carnac Stones in Brittany, France, present a far vaster and more intricate megalithic complex. Over 3,000 prehistoric standing stones are arranged in precise, seemingly endless rows and circles, stretching for miles. Dating back to 4500 BCE, their exact purpose is hotly debated: astronomical observatories, religious sites, or territorial markers? The sheer scale of their placement, and how these massive stones were quarried and erected by Neolithic people, remains an engineering and logistical mystery that continues to challenge modern science.