One of the good lasting things is the island they created out in the river to put it on... Notre Dame Island... it's now a park where Montreal's F1 track is... it's one of the better tracks in the World Championship... you can take the subway to get to it... and once you're there, you're in a park on the water with a great view of the skyline... as race tracks go, it's hard to beat...
If you ever go to the F1 race there, or even just watch it on TV, there are 2 notable places on the track...
* The hairpin at Turn 11: As you can see, this is where the cars do the most turning, very sharply, from high speed, of any turn... F1 cars have so much grip that for three years in a row, they ripped the asphalt off the road in Turn 11... (think about that for a sec)... by the end of the race, the cars would have to take a different, less-optimal line through that turn because the place where they wanted to go, well, it was now just a raggedy pothole. So, they'd re-pave it for the next year's race... and the same thing would happen. (I dunno what they finally did to fix it, but it seems like the asphalt is better at staying in place lately..)
* Just past Turns 14 and 15, on the same side of the track as the little red arrow, is the "Wall of Champions"... cars come flying down the road from the hairpin @ Turn 11, reach speeds of 200mph, then have to brake like crazy so they can zig-zag thru the 14-15 chicane... at which point it's time to get on the gas again to hustle on down to turns 1, 2, and 3. The best way to do that is to (a) get on the gas as soon as you can while you're still in the middle of Turn 14, and (b ) use all the road you've got coming out of Turn 15.
Well, one thing the diagram doesn't show you is that when you "use all the road you've got" coming out of Turn 15, you're up against a very large concrete wall that is *right next* to the track... when they are in a particular hurry, the best drivers take that corner such that they come within an inch or less of that wall (I am not making this up). It's called the Wall of Champions because of all the times a brand-name driver was intending to come within about a half-inch of that wall... but missed by an inch or three.. (ooops)... it turns out worse than when a pitcher misses by an inch or three...