In 1904, St. Louis, MO, was the host of the celebrated Louisiana Purchase Exposition, also known as the World’s Fair. Spanning 1,272 acres of land, it was the largest fair ever held at that time. Its fascinating attractions brought visitors from all over the world. Today, you can still see a number of remaining exhibits from the historic fair in the city. Here are 5 World’s Fair attractions that you must visit when you’re in St. Louis.