That futuristic city it's 100% of my imagination. To realise this I was inspired by Sci-fi buildings and futuristic buildings. Each of those buildings has both exterior and interior with stairs, the storeyed building have also many floors. Each of those buildings has a door. When I've render those images to show my city, I use 2 different HDRi images to show you how the city looks at day or at night.
The entire creation was realised with Blender Cycles.