Istanbul: For a full sized image click here
Istanbul has been a tourist destination for well over a century now, and both of these maps make it look like a nice place to visit.
The second map does a nice job of compressing the city to show an enlarged Fatih while still including the entire Bosphorus up to the black sea. In the spot between Besiktas and Kurucesme, where one might expect to find Ortakoy, there is simply a black square labelled "Coal Depot." If only.
Finally, there were no dates for either of these maps. The first one has the Taksim Casino, which was built in the early '40s, but not Barbaros Bulvari, built in the mid '50s. I'm sure there are real Istanbul history enthusiasts who could narrow it down even more. In trying, all I found was this story about the Wagons-Lits/Cook company.
Source: Ataturk Kitapligi Map Collection, Hr_000822 and Hr_000041