We have zero evidence of domesticated plants or animals before 10-12 thousand yeas BP. If there were great civilizations before that, there would be evidence in the DNA of plants and animals. There is not. The idea of a great civilization without any domestic agriculture or livestock is nonsense.

There is no room for aliens either. Not one shred of evidence.

I know people like Erich von Daniken and Graham Hancock sound appealing, but they aren't. They're also racists. Von Daniken and Hancock believe in a master white race that created everything.

Hancock:

Professor Patrick Nunn, who specializes in researching Pacific geography and archaeology at the University of the Sunshine Coast in Australia, told the Australian Broadcasting Corporation that Hancock’s theories about who built Nan Madol strip Indigenous peoples of their rich histories and can be traced to “racist philosophies” and “white supremacist” ideologies of the 19th century.

In a May 2000 essay published on his website, Hancock writes: “I have consistently argued that the Americas were inhabited in prehistoric times by a variety of ethnic groups – Negroid, Caucasoid and Mongoloid … Such ideas have caused deep offense to some American Indians, who have long claimed to be the only ‘native’ Americans.”

He goes on to describe various prehistoric artifacts that he says prove the presence of Caucasians and Africans before Columbus landed on the continent in 1492. This includes his research into the Aztec god Quetzalcoatl, who he says was described by the Aztecs as “tall, white-skinned and red bearded – sometimes blue eyed as well”.

https://www.theguardian.com/us-news/article/2024/jul/01/netflix-ancient-apocalypse-canceled

If we look to von Däniken’s work, there can be little doubt that his racial beliefs influenced his extraterrestrial theories. After a short stint in jail for fraud and either writing or appropriating the material for a number of other books that developed his ancient astronauts theory, von Däniken published Signs of the Gods? in 1979. It is here that many of his racial views are most boldly stated. British archaeology officer Keith Fitzpatrick-Matthews points out on his Bad Archaeology blog just a few of the many racist questions and statements posed by the author: “Was the black race a failure and did the extraterrestrials change the genetic code by gene surgery and then programme a white or a yellow race?” He also printed beliefs about the innate talents of certain races: “Nearly all negroes are musical; they have rhythm in their blood.” Von Däniken also consistently uses the term “negroid race” in comparison with “Caucasians.”

https://list.uvm.edu/cgi-bin/wa?A3=ind1811&L=SCIENCE-FOR-THE-PEOPLE&E=8bit&P=601416&B=--------------E30651E1332C1BC529D29260&T=text%2Fhtml;%20charset=utf-8

This all comes from 19th century racist ideas, especially those of Madame Blavatsky:

https://en.wikipedia.org/wiki/Helena_Blavatsky

You are falling for racist propaganda. Please don't.