I'm surprised there's a thread on great stadiums, and no mention of the Stade Olympique in Montreal..
I'm a Toronto and Blue Jays fan, but I love this stadium..
Tallest freestanding slanted structure in the world:
It may have been a financial failure (3rd most expensive stadium ever built, City of Montreal
just finished paying it off),
and the interior wasn't even complete in time for the 1976 opening ceremonies,
but it is still a great stadium nonetheless, one of the best in Canada.