hammond stadium where the minnesota twins play there. steve, good morning. reporter: bill, good morning. twins are warming up for a game with the orioles. spring training used to be wood grand stands in the middle of nowhere but evolved into million door lar theme parks as. it began as a fat farm for baseball players. 125 years later, the drills are the same but the business model has changed. six weeks of commerce means that they re going to make a lot of money from spring training. reporter: a billion dollar a year industry with fans coming to florida from across the nation. great park by the way. reporter: paying for something not easy to find today, intimacy, professional sports. dad took us when we were young. i m bringing him now. reporter: lee county is home to the boston red sox and the minnesota twins. government studies estimate fans spent $50 million a year in the local economy. souvenir program!.