Vancouver’s Director of Planning, Brent Toderian, has a good summary of the recently completed re:CONNECT competition that envisioned alternatives to Georgia and Dunsmuir Viaducts.
The picture above is from my favourite submission, #71 -Viaducts = Parks+. I like the water and parks stretching toward Strathcona, but the most interesting feature is the tiered park that moves through the 3rd story of the buildings along the waterfront.