The National Constitution Center is a non-profit institution devoted to the Constitution of the United States. On Independence Mall in Philadelphia, Pennsylvania, the center is an interactive museum and a national town hall for constitutional dialogue, hosting government leaders, journalists, scholars, and celebrities for public discussions (including presidential debates). The center offers civic learning resources onsite and online. It does not house the original Constitution, which is stored at the National Archives Building in Washington, D.C. The groundbreaking ceremony was held on September 17, 2000, the 213th anniversary of the signing of the Constitution. The center opened on July 4, 2003, joining other historic sites and attractions in what has been called "America's most historic square mile" because of its proximity to Independence Hall and the Liberty Bell.