No, Only The Surface World.
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You have to spawn it in, or re-generate your nether if you have a pre-1.5 map
You have to find them in a nether stronghold. You can plant them in soulsand on the overworld once you have some from the nether.
You can't. You can, however, mine it in the snapshot versions of Minecraft 1.5
You cant go to Olympus but you can go to the nether.
make a wall around lava and tip water in it and repeat it to make a nether portal shape