There aren't many times in history where a library can put a whole city on pause... unless that library is a Presidential library. When a Presidential libarary opens, it is a big deal - a really big deal. Presidential libraries are there to honor a President's legacy. Their main function is to preserve and make available the papers, records, collections and other historical materials from Presidents. The first Presidential library was built for Herbert Hoover. Every president since then has had a library built for him.