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Green, glitzy, towering, domed jewels of sports-venue architecture—they're out there, folks. Er, on paper, at least.

These stadium proposals once had fans slobbering like Pavlovian hounds. But other—often far lamer—designs won out, or politics and pragmatism reared their heads and put a stop on construction of these beauties.

So strap on your double-beer-can helmet, tuck your cushion under your tush and have a virtual seat in these stadiums that never were.