A huge contempory stain glass dome suspended several hundred metres over Victoria square would be pretty unique. The dome and colours could reflect our aboriginal and recent heritage, colours of the land and blue of our sky's and the shapes of the Olga's and Uluru.
Underneath a huge paved plaza artwork of aboriginal and recent heritage.
Underground beneath the square the worlds largest collection of Aboriginal heritage and art. The east/west traffic under grounded as well and deep down provision for the eventual Victoria square rail tube station as part of the proposed
This would be an attraction to rival the opera house and make Adelaide the natural tourist gateway to the outback. Think bold 2-3 billion should do (only the price of a couple of submarines an will live for ever)