This has been one of my favorite seeds since playing. The spawn is a bit tough because you are mid jungle, but once you work your way out, there are 2 different chasms close by to get you started.(x-105, y 40, z 139), (x -121, y 40, z 288). There are at least 2 dungeons that I found in mine shafts throughout the cave system. You also have wild mountain formations, desert, tundra, and large oceans with hidden caves underneath. Did I mention how cool the chasms are? The caves are virtually endless and they all seem to connect.