I've heard Romainian described as "a cross between Latin and Russian," and Farsi described as "a cross between Latin and Arabic." As a member of the last generation to learn the Latin mass, I've considered revisiting that language someday. Perhaps in the course of home schooling my youngest two kids? My older two and I studied NT Greek together once upon a time, attending Sunday classes taught by an erudite local pastor.
I'm working on Italian at the moment, and running into a lot of cognates.
One serious disadvantage to learning Latin is the classical literature. Rumor has it that Unitarianism got started when pastors with classical educations, and more brains than sense, began looking upon the God of the Bible with the same condesending contempt as the Latin writers had for their deities.