Hart Crane's Atlantis.
Paterson, Dogtown.
Brodsky : "Mankind was put on this earth for one purpose : to make civilization."
Mandelstam's definition of his poetics (Acmeism): "nostalgia for world culture".
& on the other hand, Akhmatova, transmuting Leningrad (& Russia) into herself.

The idea that every human being has a rightful place in a Kosmopolis, before which both the imperial metropolis and the colonial backwater are ephemeral parochialisms, fleeting fashions of human behavior, passing away.

World-city, evoked most forcefully by those who miss it the most - the exiled homeless hobo poet, Mandelstam, Tsvetaeva, Walt Whitman wandering around ("W.W. is his name crowned here & gone").