If a pitch is hit in a domed stadium and the ball hits the catwalk at the top of the roof in fair territory but on the descent is caught in foul territory is the ball fair or foul?

The "fairness" of the ball depends on the rules in that particular stadium. In the 2004 playoffs a ball hit the catwalk in Houston in fair territory and was caught in fair territory, but was ruled foul, because of the rules at minute maid park. On the other hand in Minnesota, a ball atriking the catwalk is automatically fair whether it lands in fair territory or not.