I've never visited one ... but this image library wants images for an upcoming book.

http://www.fotolibra.com/seller/news/feed.php#p1308

You'll have to register with them as a seller, but it may be worthwhile if you follow NFL and have many suitable images.

NFL & College Football Stadiums
Minimum pixel dimensions: 4000x3000
Landscape, Portrait, Square, Panorama; colour or historic
Deadline: Friday, November 12, 2010; 12:00 GMT

An illustrated book publisher is planning a lavish coffee table book illustrating all the National Football League and College Football stadiums in the USA. They want photographs of the stadiums' exteriors and interiors, historic and present day, with and without a game being played.