General Motors built the Futurliner to promote a traveling show called the "GM Parade of Progress" in the 1940s and '50s. The slippery-lined bus, which was penned by the legendary Harley Earl ...

The tenth Futurliner toured the country as part of GM's Parade of Progress in 1940 before being "retired," but the 12-ton, 33-foot behemoth lived a rich life after its initial tour of duty.