Here's the preset:

3;7,240*1,2*3,2;4;stronghold(count=100000 distance=1 spread=420),decoration,dungeon 

Please note that this may take a long time to generate, especially if you aren't running this on a good PC. This preset generates a massive stronghold that stretches from the bottom of the world to near the top, and approximately 1500 blocks outwards in every direction. Words alone aren't enough to describe this, so here are some screenshots.