Why is it these monuments would just now be found, when other empires monuments and building have been found for 100's of years?

Also, according to the scriptures, David conquered nations all around him, north south east west, and there was also an army that was eight times the size of the roman empire's army in Israel. Now, with this much might and conquering there should already be evidence all over the place wouldn't you agree?

By Hebrew Bible I mean the hebrew scriptures from Genesis to Malachi.