#############################
Video Source: www.youtube.com/watch?v=8lg-V-XS87E
Lost Civilizations: Part I • Over the span of human history numerous empires and city-states have collapsed. Often the circumstances of their demise remain mysterious. However, recent research may have shed some light on the collapse of several civilizations. Tune in to learn more. • Home: http://howstuffworks.com • Facebook: / conspiracystuff • Twitter: / conspiracystuff • iTunes: http://itunes.apple.com/us/podcast/st... • Playlist: • Stuff They Don't Want You To Know
#############################
New on site