Fall of Rome

AFAIK there are none. It's just that there are four eras in the game by default.
 
That's the end of the line for your scientists. The tech trees end there. Same in many of the other conquests.

I guess the logic is that the game should be over by the time you find yourself spending too much time researching those mystery techs. If you get to the end of the trees quickly just drop your research down to 0%, rake in the dollar and go spending.
 
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