There is reason to believe that radioactive traces, vitrified sand, metal objects dated before smelting, and accounts of the destruction of cities by bombardment from the skies could all be due to meteor and comet impacts. This would require a rethinking of the traditional accounts of early civilization and human prehistory but does not provide evidence for help from aliens or that early human civilization was somehow in advance of modern technology.
See Graham Hancock’s “America Before”, or just follow the latest results of DNA and blood group tracings for ancient populations ... no aliens required, rather it is necessary to think in a different manner that we do today (logical as opposed to symbolic thinking) to even begin to understand anything the ancients achieved.
Also keep in mind that most of the very ancient world in now under many hundreds of feet of water, silt and mud.