7426673141844924257Minecraft 1.5 - 1.5.2 Seed
This is a default world type and the huge mountains are not that far from where you spawn.
Seed Code: 7426673141844924257
X: 51 / Y: 64 / Z: 19
X: 275 / Y: 111 / Z: -1
There are some caves and floating mountains but alot of extreme hills and mountains.