Even the most intelligent people in the world don’t know everything. You can spend your whole life studying science or history, but there will still be things that you’ll never completely understand. That doesn’t just go for new discoveries - it also covers objects and places that were created by our ancient ancestors. We might have vastly underestimated the abilities and intelligence of the civilizations that came before us, because all of the things you’re about to see remain a mystery to all the experts who’ve ever studied them.