Fēlēs mercātōrēs vīsitat.
Sunt multae statuae in pontes. Sunt feles in pontes!
How would you answer these questions?
Why do you think people build giant tombs?
Why do you think the rulers of Rome built the Circus Maximus?
What other parts of the world might have had cities this large at this time?
Wikipedia list of the largest ancient cities.