This mountin (X:950, Z:1000) is the center of a crazy concentration of caves, structures and biomes. The Lush caves stretch for over 1700 blocks in each direction from y100 to bedrock. Found this in my survival world.
Also within a few hundred blocks of the mountian:
-Trial Chambers
-Stronghold
-2 Pale Garden Biomes
-Woodland Mansion
-Massive Mineshaft
-Tripe Cave Spider Spawner
-Double Cave Spider Spawner
-Village
Seed: -2744497756135466756
by Lagiacrus111