Addon: Creeping Crypts
With this Add-On, you will see some tower-like structures in your world that have dungeons underneath! These dungeons can get large, so be sure to pack an extra lunch!
Created By Elektrika
These dungeons have several rooms. When you explore your world, you may randomly encounter structures that look like this from time-to-time.
These structures are VERY RARE. They may not generate within 500-3000 blocks of you.
The dungeons can get quite expansive at times, however if you have a low-end device, your screen could potentially freeze for a few seconds while it generates. These dungeons will not cut into each other, instead they are programmed to connect to themselves so you can avoid the eyesore of them ramming into each other nonsensically.
You must have this experiment turned on to use this add-on