Edward leedskalnin

supposedly this guy discovered how the megalyths were built, and used his discovery to construct the coral castle in florida, which is absolutely amazing, the front entrance is a 9 tonne block of stone which is so accurately placed on it's center of gravity that anyone can open it, just wondering if anyone knows alot about him as i was only able to read about him for a few pages in the book i'm reading, ancient secret sciences by laura jadczyk