There definitely were developed human civilizations before this current one. Evidence of construction is emerging all over the place, that does not fit with our account of human history.
Houston anthropologist, Dr. Semir Osmanagich, founder of the Bosnian Archaeology Park, the most active archaeology site in the world, declares that irrefutable scientific evidence exists of ancient civilizations with advanced technology that leaves us no choice but to change our recorded history. An examination of the age of structures across the earth reveals conclusively that they were built by advanced civilizations from over 29,000 years ago. Read full article.