Aloha Stadium, Honolulu, Hawai'i
The whole "core 10" thing doesn't work at all in a saline climate. Instead of forming a "tight rust" coating, the steel kept rusting and eventually a lot of lawsuits and replacement work later, the whole thing was repainted in the same color. The stadium can be configured for different events - altho last I heard, they seldom do it anymore because the hydraulics are expensive to maintain/doesn't work so good anymore.
From Photobucket:
Football Configuration
Baseball Configuration
John Hancock Center, Chicago
I'm surprised nobody posted this one yet - that's the first thing I thought of when I think of "core 10" rusting steel.