Some people say that this art is referencing to an Overwatch map called Ilios

Or this just a town somewhere on the world with a similar look?

5pb said:

Some people say that this art is referencing to an Overwatch map called Ilios

Or this just a town somewhere on the world with a similar look?

It may just reference cities in Greece, specifically Santorini, which Ilios of Overwatch also took inspiration from. Which is also a map in CSGO.