As many experienced commenters below have already noted, nearly any piece of substantial, revenue-generating, long-lived code will ascend to a place full of dragons and mysticism. The more interesting debates revolve around:

1) How did it get that way, and what can we learn from that? 2) Is it inevitable that all software will end up like that? 3) How can an organization ever successfully sunset or move to a more maintainable system? Or should they even aspire to that?