Built in 1998, the park holds more than 48,000 fans and was the first stadium to have a retractable roof. The roof is left open just long enough to make sure it doesn't damage the grass. After closure the air conditioning system can cool the entire stadium by 30 degrees in three hours. Be prepared for a hot one no matter what in Arizona! That's why Chase Field has a pool in their outfield that can be rented by 35 guests for gameday.