I remember reading a series of books in which science is outlawed. The main character and a small group are looking for sites which include a pre nuclear war silo or bunker complex with hi-tech defences.
Years have passed on Isis, but life has gone backward, not forward. Under their leader, Mark London, the settlers have abandoned the technological knowledge of their forefathers. Upper Isis is now a forbidden zone, and the history of the first inhabitants from Earth has been replaced by myth. But one inquiring young man yearns to know the truth, and soon he gets the chance to find it.
I thought I remembered this one coming up here before, so I searched the site for [story-identification] silo, which led me to 90's YA novel: Youth leaves village against village taboos, discovers missile silo and that the world is post-apocalypse