If you were around in the late ’60s and early ’70s you probably remember watching the Apollo moon launches. The rocket that lifted off was the mighty Saturn V, now the most famous rocket in the world.

Popular Mechanics states that “When fully loaded with propellants, the rocket weighed 6.2 million pounds. It had more than 3 million parts. At full throttle, its five first-stage engines produced a thundering 7.6 million pounds of thrust at liftoff. All told, a Saturn V churned out more power than 85 Hoover Dams or, if you prefer, enough energy to light up New York City for 75 minutes.” The largest of the engines on the Saturn V were the five F1 engines seen here.

There were three unused Saturn Vs left, due to budget cuts to the Apollo program. One of the three can be found at the Johnson Space Center in Houston.