I hope I'm not gonna be too much off topic but ...
ancient humans might never had the technology we have now ... but being advanced is not only related to technology ... it can be related to strategy (an other way to do some things) and it is not because we have no physical proof (a few like that little girl that have be momified and still looks like she's alive / the way some piramides and special visual effects have been done) that they haven't found things that we might try to find out ourselves now (in an other way, with other methods).
I feel like we do expect too much on technology, not enough on strategy ... (also both can be mixed)