The Saint Louis Science Center, founded as a planetarium in 1963, is a collection of buildings including a science museum and planetarium in St. Louis, Missouri, on the southeastern corner of Forest Park. With over 750 exhibits in a complex of over 300,000 square feet (28,000 m²), it is among the largest of its type in the country, and according to the Association of Science and Technology Centers, is one of the top 5 science centers in the United States. In 1991, it was the most visited science center in the world.