The Romans had a formula for concrete so good there are still blocks of the stuff around and in use, some of it submerged in saltwater for 2,000 years. It was a mystery for centuries, only recently deciphered.
Now, some people might say, oh but the Romans didn't have modern tech, they didn't have modern chemistry labs, they must have learned their tricks from aliens! How could they possibly have come up with roads that would last 2000 years when in the 21st century we can't build one to last ten? How could they have devised concrete that set underwater and never fell apart? Or build aqueducts hundreds of miles long that still stand to this day?
The answer is that human beings are considerably smarter than a lot of modern, science-illiterate, tech-dependent humans can grasp. If the Incas managed to haul 100-tonne blocks of stone up a mountain, the overwhelmingly likely explanation is that they devised an ingenious engineering solution that was forgotten and hasn't been unravelled (yet?), not that aliens came along and did the hard work for them.
Looking to aliens to explain stuff like this is lazy, sensationalistic pseudoscience and it always has been. That's why I find shows like this offensive. The irony is that their fanciful speculations are actually the result of a spectacular failure of imagination.