There's a live web camera linked from the Minnesota Vikings website where you can see the construction work being done on the new structure. And last time I checked, things were hopping. You can also switch views from the live stream to an aerial view or a stadium view.
Did you know that 80% of the steel and concrete from the 32-year-old stadium will be recycled? Learn more about the construction process and check out this article with news and notes about the new stadium.