The Phillips Exeter Academy Library is the biggest library in the world when it comes to secondary school libraries. In a
way, this is one of the most impressive libraries on our list for being merely a part of a prep school, albeit one of the
wealthiest prep schools in the world. Designed by architect Louis Kahn, the the structure has won numerous architectural
awards, including a Twenty-five Year Award by the American Institute of Architects, which is given to only one prestigious
building each year. The library was even commemorated on a U.S. Postal Service stamp in 2005 as one of 12 stamp-worthy
Masterworks of Modern American Architecture.