Comment by gus_massa

Slightly related, but Antikythera mechanism was build ~150BC and has a lot of advanced construction steps. If you have a few hour to go down the rabbit hole I recommend the Clickspring reconstruction serie https://www.youtube.com/playlist?list=PLZioPDnFPNsHnyxfygxA0...

Perhaps someone can ask the guy to build a "roman" steam engine.