Houston, Milwaikee, Arizona have retractable roofs among others.
ALL NEW stadiums that will be built in the next 15 years will be retractable roof stadiums. Football stadiums will be retractable roof stadiums as well
Minnesota-I was at the 87 world series there and I can tell you that I have never seen a bigger home court/field advantage in my life. Twins had/have super fans. That being sad, we should have still won that 87 series, you cheating bastards!