14. Only 11 1970 Plymouth Hemi Barracuda Were Ever Made
A car that was once worth less than $6,000 is estimated to be worth over $5 million today. The 1970 Hemi 426ci Hemi Barracuda is among the rarest muscle cars in the world, and most sought after. While the one estimated to be worth that insane sum isn’t currently being dealt, one ‘70 ‘Cuda fetched $3.4 million at a Mecum auction in 2014. That particular muscle car featured a 426-cubic-inch Hemi V-8 engine, dual four-barrel carburetors, the 727 automatic transmission, the Super Track Pak option and a power convertible top.