"Old landmarks fall in nearly every block... and the face of the city is changing so rapidly that the time is not too far distant when a search for a building 50 years old will be in vain." — Herald, 1925.The demolition firm of Whelan the Wrecker was a Melbourne institution for a hundred years (1892–1992). Its famous sign – 'Whelan the Wrecker is Here' on a pile of shifting rubble – was…