3. Chrysler Turbine Car

During the early 1960s, Chrysler captured imaginations by producing around 50 Turbine Cars powered by actual jet engines. These sleek vehicles promised ultra-smooth rides and minimal maintenance, thanks to their revolutionary powerplants.
However, they ultimately faltered due to poor fuel economy, troublesome emissions, and high production costs. Despite its limited run, the Turbine Car has become a legendary “what if”—a tantalizing glimpse at an alternate automotive reality that never took hold.
Smithsonian Channel