The Egyptian pyramids, the viaducts of ancient Rome and the Athenian Acropolis are all edifices thousands of years old. But, much of what we've built is already crumbling. Why is that? What will stand after we're gone? Will we leave anything worth preserving?  And, what about the aesthetics? Even North American commercial buildings of several decades ago had artistic features and interesting designs built in. Whereas today, most downtown buildings are merely giant cubes of glass and steel. We ask two eminent Canadian architects and an expert in architectural conservation to share their vision. Douglas Cardinal, who designed the renowned Museum of Civilisation in Hull, joined us from Ottawa. Ken Greenberg, the author of Walking Home, The Life and Lessons of a City Builder, joined us from Toronto. And, Dinu Bumbaru, a leading member of the International Council for Monuments and Sites, joined us from Montreal.