Funny thing is, it's definitely real as it's on a public display, but nobody knows who built it and, most importantly, why they built it. There are numerous equally plausible yet contradicting legends, some people tried to investigate but results were inconclusive, possibly because there were multiple built completely independently, or because it was a top secret project and intelligence planted red herrings. Maybe some vodka drinking took place. But, one thing that is common amongst most legends is that it couldn't steer for shit, hence why it was scrapped.