Oh Heck Oh God, Chaos!

At the time, All was lost. Humanity eventually had to hide away from the Zombies.
Over time, Zombies became fewer in numbers, and the World eventually restored itself. The Remaining Survivors came out of hiding and were forced to start from scratch.
After a While; You find yourself in a World Filled with Villages of Multiple Cultures, Lost Cities, and Familiar Foes. But you soon learn;
Zombies still Exist, and are smarter than ever, along with a few other hostile mobs!
From what it seems, Everything that remains of the Old World was buried, or in ruins.

Credits go to all Mod Creators!
Optifine is Very much Recommended.