Okay, mast all of us know that Iroh has visited the spirit world, right? Well, the question is why and how. My therory is that after his son's death, Iroh became deply depresed. To the point that he tryed to kill himself in order to be with his son. He got to the spirit world, where he incountered Avatar Roku, or some other spirit. They promptly turend him around and sent him back to a completly healed body, saying something along the lines of the following text.

Spirit: You are still needed on Earth.
Iroh: (depresed) But I want to be with my son.
Spirit: No, you MUST guied and protect your nephew, Zuko. In a short while, he will incounter hard ships, the first will be the loss of his mother. You, Iroh, are still needed. When your time is right, you will be reunited with your son, but not for a long while.
Iroh: But...
Spitit: And a word of advice, DO NOT trifle with the spirits. DO NOT meddle in the affairs of spirits, for you are crunchy and tast good with ketup. Noe, GO!

And with that, he came back, and is now the Iroh we know and love.

I do have a different version, where insted of killing himself, he goses in to trance and trys to bring him back to life by beging with the spirits, with the same general results.

So, what do you guys think?

we don't know if he went to the Spirit World or not

Zhao said he heard rumors of it, while it is probably true, it is not fact until Iroh admits it and probably tells the story. if your scenario is right, Iroh will die and tell Zuko about this and say that the Spirit told him that Zuko will train the Avatar and become Fire Lord

at least if my version of events is true that is what will happen

Then how do you explain how he say Aang when Aang was in the spirit world? I think those two are conected as well. Also, Iroh semes to know alot about the spirits. He is also very wise, both of which he could have gotten in the spirit world. Also remember he said that he was a different man after that battle. There is a defenit conection.

Sounds alright.

When aang entered the spirit world for the first time, ( The spirit world?? (winter solstice, part 1) episode)
aang got on the back of?? roku's dragon, when aang went towards the moon shaped island he flew over uncle iroh who was in captivity of some earth kingdom soldiers iroh saw aang flying over but the earthkingdom soldiers didn't also appa,momo and katara couldn't see aang... so that means he has been in the spirit world that's the only place were you could get that ability....

Or could Iroh have gone during the battle of Bah Sing Se? Cause for 600 days.. Perhaps something he was told there was one of the reasons he decided to give in. I have wondered and come up with a few theorys since the episode??he saw Aang and Roku's dragon.

perhaps after he laid siege on ba sing sei he traveled through the desert, found the library and figured out how to get to the spirit world?
??