There's a couple of early Curtis flying boats at the
Canadian Air & Space Museum in Rockcliffe, Ontario (just east of Ottawa). They also have a Canso and used (?) to have two Canadian Vickers aircraft on display - one a wreck as pulled out of the crash site and one a modern replica.
The Naval Museum at Jeronimos (sp?) in Lisbon has an original Curtis and a floatplane that made the first Transatlantic crossing by flying from destroyer to destroyer. They also have what looks suspiciously like a Grumman Mallard.
If you're interested in modern flyingboats, don't forget that all Canadian Provinces operate the Canadair 215T/415 Waterbomber (not sure if any Cansos are still in operation) and there are similar squadrons in
Europe.