My non-NRL favourites...
1. SkyDome, Toronto - Final game of the 92/93 World Series, Blue Jays vs the Philadelphia Phillies. My Mum had to go back to Sydney as her sister was very ill with cancer. I was with my Dad in a company box (he basically gave his customers the finger so he and I could watch and enjoy the game together). The game was in the balance and I actually talked to the man upstairs and asked hm to let Joe Carter hit a homer for my Aunty. Next pitch he hit the series-winning homer and it landed about 10 metres under our box. I kid you not. I bawled my eyes out.
That's the first time I've ever told that story and now I'm
2. Maple Leaf Gardens, Toronto - first NHL game after having moved to Canada, and it was the Western Conference finals game 5. The Leafs went down 2-0 early to the LA Kings but fought back to win the game 3-2 in overtime. I also saw about another 6 or 7 games there. You can't beat walking home from the hockey after a win and the beer coat in -30 temperatures.
3. Highbury, Arsenal - My in-laws are mad Arsenal supporters and we had tickets especially organised for us (a lot of grovelling by the family to Arsenal management) and we ended up with seats in the middle of a sea of red. Who were they playing? Newcastle of course, and Newcastle won. And I made it out alive.
4. Air Canada Centre, Toronto - The pinnacle of NHL stadiums (they played the recent World Cup final there) and an awesome place to see hockey. They have a great guided tour of the facilities and a phenomonal atmosphere (they sell out every game and there's a very long waiting list for season tickets; these things are handed down from generation to generation). I've seen 3 or 4 games there.