I guess you fared better than we did...
We still have the Biosphere (US pavillion) which eventually became a natural sciences museum but was closed by the former government, the France and Quebec pavilions are now a casino operated by the provincial lottery, the Canadian pavilion is used for offices, the Haiti pavilion has been renovated a few years ago but nobody knows what to do with it, Place des Nations us used by public works to just dump stuff... we have a few bridges and sculptures that survived...
The amusement part now belongs to Six Flags. There's a marina that's underutilized and the Metro that remains.
The Expo site was actually used in the filming of the original Battlestar Galactica when they needed to film a futuristic city that is in ruins...