Interesting how the pyramids have been around for 4500 years and we still don't know all about their structure... Fun fact: there's a Neolithic site in Ireland, Newgrange, that's actually older than the pyramids. Fascinating and worth a visit: https://en.wikipedia.org/wiki/Newgrange
Nothing blows my mind more than Göbekli Tepe, especially its age. https://en.m.wikipedia.org/wiki/Göbekli_Tepe
Funner fact: the Great Pyramids were built closer in time to the invention of mobile phones than to the construction of Göbekli Tepe. Human history is way deep.
Funnest fact: if we don't fuck it up, we're still only at the dawn of history, not at the end of it.