I just came across this tidbit: http://www.cnn.com/2011/US/06/21/navy.carrier.ncaa.game/index.html?hpt=us_c2.
Apparently, the NCAA might have the first basketball game of the season on the USS Carl Vinson, which apparently was integral in the first US responses to 9/11 in Afghanistan back in 2001.
It got me thinking: what other sports have been hosted in unusual venues? Fortunately, this Sports Illustrated feature provided an answer:http://sportsillustrated.cnn.com/multimedia/photo_gallery/1011/sports.unusual.venues/content.1.html
Some are sort of run-of-the-mill, but some, like Andre Agassi and Roger Federer playing tennis on a helipad in Dubai and a WNBA game in Radio City Music Hall yield some stunning photographs. Take note of the fact that Roger Federer and Wrigley field appear in like, half of these entries.