This "field of dreams" is a $356 million natural-grass baseball stadium with a retractable roof and a center-field swimming pool (rent: $4,300 per game) where home runs make a big splash. "The Bob," as locals know it, is home to the Arizona Diamondbacks. A restaurant and microbrewery are built into the stadium. A museum, Cox Clubhouse, displays Hall of Fame memorabilia, and features high-tech video productions and interactive games.