What's a good book you've read and would recommend that is > 50 years old?

Building https://srcbook.com // creator of the https://blockchainsmokers.xyz

So many books - so little time - what kind of books are you looking for

creating and destroying; built flying cars & autonomous vehicles, now building /faust, more here: /july, web: july.rocks

I'm a very open minded and curious person, so feel free to go wild and surprise me!

I previously had a minor unhealthy obsession with the Peloponnesian War, of course reading Thucydides is a must: 

https://www.amazon.com/History-Peloponnesian-War-Thucydides/dp/0140440399