This is Titan City – a staggering creation by Redditor FoxGaming, who posted lots of flattering shots of his creation. The city itself has been in development since October 2012 and is modeled after New York City. What originally started out as a solo project was shifted to a group effort, with FoxGaming leading the pack.
FoxGaming is apparently a fan of engineering (in case his project isn’t evidence enough), and he built each city block, each building after real-world methods of engineering and craftsmanship that he saw in documentaries. Each building took between one to ten hours, and each one has at least ten floors, complete with stairs and elevators.
There are tons of work in progress shots in the link above, and just in case you wanted to experience Titan City firsthand, you can download the current version of the map itself for both Xbox 360 and PC here, while the Playstation 3 map is still being worked on.