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At this point, you hav a 50/50 shot of having the right door, I would think, and changing your selection would be a matter of personal preference. Odss are neither for nor against you.

What is the only natural wonder that can be seen from space?

My apologies to Karyoker,  here I was getting mif'd that he phrased his question wrong throwing us off, and all along he was correct, and I made a nasty assumption because I'm going thru a byotchy period now..

slips kappy some evening primrose oil

I havnt been monitoring this thread since I posted I probably phrased that questuion wrong indeed...Witch was right It is the great wall...

rules are u cant google but here are the 8wonders
 maybe the adjective was a ff....

The Great Wall the only man-made object that can be seen from space?  Baloney.  Ever asked, say, an astronaut?

http://www.straightdope.com/classics/a2_092.html

The Great Wall the only man-made object that can be seen from space?  Baloney.

so for the sake of completeness here's the answer to Monty Hall:

The Problem With the Problem
Mr. Hall continued: "Now do you see what happened there? The higher the cash sum I offered you, the more you thought the car was behind Door 2. I wanted to con you into switching there, because I knew the car was behind 1. That's the kind of thing I can do when I'm in control of the game. You may think you have probability going for you when you follow the answer in her column, but there's the pyschological factor to consider."

He proceeded to prove his case by winning the next eight rounds. Whenever the contestant began with the wrong door, Mr. Hall promptly opened it and awarded the goat; whenever the contestant started out with the right door, Mr. Hall allowed him to switch doors and get another goat. The only way to win a car would have been to disregard Ms. vos Savant's advice and stick with the original door.

Was Mr. Hall cheating? Not according to the rules of the show, because he did have the option of not offering the switch, and he usually did not offer it.

And although Mr. Hall might have been violating the spirit of Ms. vos Savant's problem, he was not violating its letter. Dr. Diaconis and Mr. Gardner both noticed the same loophole when they compared Ms. vos Savant's wording of the problem with the versions they had analyzed in their articles.

"The problem is not well-formed," Mr. Gardner said, "unless it makes clear that the host must always open an empty door and offer the switch. Otherwise, if the host is malevolent, he may open another door only when it's to his advantage to let the player switch, and the probability of being right by switching could be as low as zero." Mr. Gardner said the ambiguity could be eliminated if the host promised ahead of time to open another door and then offer a switch.

Ms. vos Savant acknowledged that the ambiguity did exist in her original statement. She said it was a minor assumption that should have been made obvious by her subsequent analyses, and that did not excuse her professorial critics. "I wouldn't have minded if they had raised that objection," she said Friday, "because it would mean they really understood the problem. But they never got beyond their first mistaken impression. That's what dismayed me."

Still, because of the ambiguity in the wording, it is impossible to solve the problem as stated through mathematical reasoning. "The strict argument," Dr. Diaconis said, "would be that the question cannot be answered without knowing the motivation of the host."

Which means, of course, that the only person who can answer this version of the Monty Hall Problem is Monty Hall himself. Here is what should be the last word on the subject:

"If the host is required to open a door all the time and offer you a switch, then you should take the switch," he said. "But if he has the choice whether to allow a switch or not, beware. Caveat emptor. It all depends on his mood.

"My only advice is, if you can get me to offer you $5,000 not to open the door, take the money and go home."