Abandoned Olympic Venues

I adore the Olympics. Pageantry and drama, magical moments brought out by ages dedication, training and sacrifice. I love stories of humanity resisting adversity. None better exist.
Counterbalancing this, images of waste, neglect, rotting decay. These images tell another story of the Olympics. A sadder story.
Often hosting the Games gets presented as this transformative event. Great economic rewards heralded. I wonder how often such manifests. How much positive actually happens, and how much of the investment crumbles into dust.