Minute Maid Park (also The Ballpark at Union Station, Enron Field, and Astros Field) is a ballpark in Downtown Houston, Texas, United States that opened in 2000 to house the Houston Astros Major League Baseball team.The ballpark was Houston's first retractable-roofed stadium, protecting fans and athletes from Houston's notoriously humid weather as did its predecessor, the Astrodome, but also allowing fans to enjoy outdoor baseball during favorable weather.