I'd wager on Apollo. $25.4 billion in 1973, adjusted to $109 billion in 2010 dollars. https://en.wikipedia.org/wiki/Apollo_program#Costs https://en.wikipedia.o

I'd wager on Apollo. $25.4 billion in 1973, adjusted to $109 billion in 2010 dollars. https://en.wikipedia.org/wiki/Apollo_program#Costs https://en.wikipedia.org/wiki/Apollo_program#Costs