This is the survival world built by Gameactive and friends during the course of the Modern Moderation Server Play series on YouTube.
Specifically, it’s the world backup from the final episode, which was done moments before the town was blown to smithereens.
While the world is in Survival mode to start, cheats are enabled, so enjoy it however you like! Additionally, every player’s inventory has been dumped into a chest near their respective bed, so you can follow the path from spawn and pick up where they left off.
Obviously, this world needs the Modern Moderation pack in order to load correctly. Packs featuring the same mods may work, but I make no promises.