Hey Rootsudo! While $100,000 is not a lot of money to start something (w/ brick mortar), I would buy a large piece of agriculture land and start a poultry farm.

There is a huge subsidy in my country right now for Agriculture start-ups and it is something which could be scaled very well using the modern poultry farming techniques.

It's kind of a retirement plan I have in the back of my mind, but given the right capital I would start with the execution of the same in no time. :)