Is anyone here keen on the Ancient Tartarians? A buddy of mine at work brought them up to me the other day and I hadn't previously heard of them. After some research though I find it all to be very interesting. Basically they were a hugely powerful ancient empire whose history has been revised numerous times to cover-up their mysterious origins/technologies/etc. It is a pretty fun rabbit hole to go down.

An interesting thread on them, but there is a ton of other information out there