Some Came Searching

Someone long ago built structures which required advanced technology. Those engineers and builders left behind some astounding relics, including massive stone monoliths, megaliths, and perfectly sculptured granite monuments. Some individual stones in the structures weighed hundreds of tons.
Then the builders disappeared without a trace, except for the mythology and legends. All records, heavy machinery and other conclusive evidence of their technology were removed, for some mysterious reason.
Interstellar travel is in our near future. This is the story of Dave Warner, an aerospace engineer, who was selected to explain the ancient mysteries, and to lead our world society into the future.