Find great value on Frontier Airlines flights from DEN to IND when you book with CheapOair! Billed as the "Amateur Sports Capital of the World", Indianapolis is a major sport town. It is the capital city of the U.S. state of Indiana and the county seat of Marion County. Learn about the mystery of Freemasonry and witness handcrafted art glass windows at the Scottish Rite Cathedral. Spread across 3 acres, the White River Gardens is another classic attraction to visit. Witness numerous plants, flowers and butterflies here. Sports lovers should definitely check out the National Art Museum of Sports. It is home to largest collection of sports theme arts in the world. It houses over 800 pieces of art from over 40 different sports. This place showcases the works of popular artists that include Winslow Homer, Odgen Pleissner and LeRoy Neiman.