The minecraft seed worstseedever spawns you in a Taiga biome (winter) nearby is a huge abandoned mineshaft at the bottom of a ravine at X: -187 Z: 194.
There is a jungle biome nearby as well.
A huge cave system can be found at X: 186 Z: 2
A massive network of ravines and caves can be found at X: 22 Z: 11 this is a triple ravine at least, and goes right down to the diamond strata. surface diamonds can be seen when you hit the bottom of the ravine without digging. A dungeon can be found at X: 17 Y: 21 Z: -29