I started a project of cataloging all the megalithic sites hoping to add tags of similar construction techniques, themes and details but I very quickly realised that there are many many many more amazing ancient megalithic sites than I imagined.
Did you know there are 44 large pyramids in Egypt for starters?
I plan to come back to this at some point - visualize it something like memex, make it open source and make it easy for people to add new sites and media.
I cannot finish this by myself.