Butterfly Pavilion is located in Westminster, Colorado. It opened on July 15, 1995, and was the first stand-alone non-profit insect zoo in the United States. The 30,000-square-foot facility is situated on 11 acres of land, and contains five main exhibit areas to teach visitors about butterflies and other invertebrates. The main exhibit is an indoor rain forest filled with 1,200 free-flying tropical butterflies.