Why we still haven’t figured out what Stonehenge was for
The mysterious circle of standing stones at Stonehenge is one of the most iconic ancient sites in Europe (AFP Photo/Leon Neal)

What do we actually know about ancient astronomy? How did Egyptians know how to build the pyramids? Ricardo Liberato/wikimedia, CC BY-ND Ever since humans could look up to see the sky, we have been amazed by its beauty and untold mysteries.