Like everything else, buses have evolved along with time and technology. These models of the past will bring out the retro-futurist lover in you, as they seem something taken directly from a science fiction movie.
#1 GM Futurliner
The GM Futurliner was developed by General Motors in 1940. As awesome as it looks and even though it had a 400 horsepower diesel engine, it could barely reach 60 km/h.