00:00This isn't just a pile of rocks. It's one of the most precise seasonal markers on Earth built
00:06thousands of years before modern tools even existed. Stonehenge lines up with the sun marking
00:12key moments like the summer and winter solstices. And just days after the start of spring, it's a
00:18reminder people have been tracking the seasons for thousands of years. But the biggest question
00:24has never been why it was built. It's how. For decades, scientists believe glaciers carried
00:30these massive stones into place during the ice age. But newer research is challenging that idea.
00:36Instead of ice, it may have been humans doing the heavy lifting. Some of these stones traveled
00:41more than 100 miles. That means ancient builders likely used wooden sleds, basic tools, and a lot
00:48of coordination to move multi-ton rocks across the landscape, possibly even with the help from
00:53animals. No machines, no engines, just planning and persistence. And somehow, they didn't just
01:00move the stones, they placed them with precision, locking in alignments with the sun. That still
01:04worked today.
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