Seriously, though. How often do you think of the Roman Empire?
I know this is a joke/meme, but I sincerely think of the Roman Empire a surprising amount of times. I find myself obsessing over how Roman citizens were living just as complex lives as we are today, or about Marcus Aurelius' life and philosophy, or about how the Republic fell and became a totalitarian state.
I think about how Christians helped ruin Rome. Basically the west died and all the smarts went east. The west suffered and spread its disease ever since.