During World War II, Nazi scientists worked at a secret lab in Hillersleben to develop weapons of mass destruction. One of these proposed weapons was the Sun Gun, a space station that would focus the sun’s rays on the enemies of the Third Reich! Read the story at Damn Interesting. Link
Makes you a bit dizzy, though. :-)
On a more realistic note, Hitler should probably have used the resources on more appliable and already proven technology. Winter uniforms for the soldiers, for example.