This is a very simple trap-kind creation of mine after messing up with a TNT elevator. I believe no one wants to build this in legit survival so I share it here as a schematic.
This nuke is purely made of dispensers with a redstone clocking mechanism. Each dispenser contains 20 TNTs which will all be dispensed after the trigger one explodes, creating a chain reaction. It's small, but it creates huge explosion and destroys almost everything!!
The last two screenshots show how it destroys my world, as you can see the aftermath looks pretty devastating - it almost blows up the entire hill from the inside.
Before you rate it, please try it 1st, it is simple but awesome! Destroy your own world and see what you get :D!
~ Thanks to KUDA shaders for the screenshots.
~ In survival or adventure mode, you may simply modify it by putting a boat on a pressure plate instead of the lever, then detonate the bomb with an arrow shot from afar. Maybe taking out all the TNTs 1st, or by a single mistake, you might will be completely obliterated.
~ Good luck, have fun!