Or learn Hittite. It's got the oldest corpus in the Indo-European language family. You've got your standard assortment of Indo-European cases. Grammatical gender is animate/inanimate and the animate gender has yet to split into masculine and feminine. The script is tons of fun, especially if you write it with a stylus on clay. And as a bonus, you get to learn a smattering of Sumerian and Akkadian vocabulary.

▲

rubberpoliceman 17 hours ago | parent [-]

Animate gender didn’t split into masculine and feminine — inanimate collective plural was repurposed as feminine.

	▲	wl 15 hours ago \| parent \| next [-]
		That "repurposing" is more morphology than grammar. You also frequently find in Indo-European languages multiple cases having overlapping morphology, but that doesn't necessarily change the cases themselves. My point, in any case, is that Hittite has the older animate/inanimate genders from Proto-Indo-European (only attested in the Anatolian languages!) whereas Sanskrit has the later masculine/feminine/neuter genders.
	▲	NonHyloMorph 15 hours ago \| parent \| prev [-]
		Can you point us somewhere zo learn more about that?