Stonehenge's central altar was hauled 430 miles from Scotland

For centuries, researchers believed that the massive sandstone block at the heart of Stonehenge was moved to the Salisbury Plain by slow-creeping glaciers during the last Ice Age. However, mineral grain dating and ice-sheet modeling have revealed that nature only did part of the work. While glaciers may have pushed rocks as far as the North Sea, they never reached southern England, meaning Neolithic people had to finish the journey themselves.