Angel Mounds State Historic Site is open Tuesday through Saturday from 9a.m. until 5p.m. and from 1p.m. until 5p.m. on Sunday. We are closed Mondays. Admission includes access to the museum as well as over 100 acres of the historical site, and also any special events or exhibits that are on display or available at the time of your visit. Admission is $4.00 for adults, $2.00 for children (12 and under), and $3.50 for seniors (55 and up).