To be completely honest, I’m not sure what this build is. I found it on PlanetMinecraft, and it has the title “When Ducks Gone Wild”. At first glance, it seems like a reasonably normal custom terrain, just on an epic scale. Then you start looking at the details – a pony with a bus in a suspicious place, a hamburger, an antsnake. The list of oddities goes on. According to its creators moustafa74 and rastammole, the theme is “what the heck”, and the map was created for a modded French youtube series, and is playable in survival.
I’m still not 100% sure myself, but the world does look awesome.
If you agree with me, or just want to download the map, you can at PlanetMinecraft.