Long before the Plateau-Mont-Royal became one of Montreal’s trendiest neighbourhoods, the area was home to a 19th-century botanical garden and zoo where Montrealers marvelled at the sight of hippopotamuses, acrobatic circus acts and a live whale in a tank.This piece of history has resurfaced in recent weeks thanks to an archeological dig that unearthed what is believed to be part of a fountain marking the former site’s entrance.