 The county has a developed tourism industry . The main attractions are the historic sites of Corydon , the county 's golf courses , the Horseshoe Riverboat Casino and Hotel , and the area 's two famous caves : Squire Boone Caverns near Mauckport and Wyandotte Caves in adjoining Crawford County . The casino is the county 's single largest source of tax revenue and produced $ 23 @.@ 5 million in tax revenue during 2007 . 
