why haven't modern day humans made anything of actual value? all of our buildings and stuff are flimsy steel and glass, and almost everything we've done would be gone in 100 years. We flew to the moon just to say we did and haven't been back. Ancients built monuments (that we can't 👀) that have last thousands, tens of thousands, hundreds of thousands I can't think of a single thing that would last 100+ besides Mount Rushmore.