how about a connection of places that used to be the largest city in the world, or used to be located in the largest cities in the wold.

Memphis and its Necropolis – the Pyramid Fields from Giza to Dahshur. Memphis was largest city from 3100 B.C. to 2800 B.C.
Ancient Thebes with its Necropolis - largest city around 2000 B.C.
Yin Xu -Around 1300 B.C.
Carthage -around 300 B.C.
Rome -from 0-300 A.D.
Istanbul - from 350-550 A.D.
Cordoba -From 920-1000 A.D.
Merv -Around 1150 A.D.
Cairo -1315-1400
Beijing (imperial Palace, Great Wall, Temple of Heaven, Ect.) -1425-1625
London (Kew, Tower of London, Ect.) 1820-1915
New York (Statue of Liberty)

possibly Archaeological Ruins at Moenjodaro : this is disputed whether it was ever the largest city.

Interesting connection suggestion -
Teotihuacan is also often cited
" During its zenith (150-450 AD) it may have had more than 100,000 inhabitants placing it among the largest cities of the world in this period"
Other suggestions push this higher
" At its height the city covered over 30 km² (over 11½ square miles), and probably housed a population of over 150,000 people, possibly as many as 250,000."

There will be many definitional and estimation problems (it is hard enough to agree the definition for the current largest city - it depends so much on governmental boundaries, whether the total megalopolis is counted, what about "area" rather than "population" etc) so probably better to describe as "Formerly was among the largest cities in the world" and show what is known about dates and conjectured population