Spellman Museum of Stamps & Postal History

The museum was founded in 1960, attended by a host of postal and philatelic dignitaries, and now contains over two million philatelic items, ranging from postage stamps, to postal history, to artifacts of communications through the mails. The collections that make up the museum are the personal collection of Cardinal Frances Spellman, the collections from the Philadelphia National Philatelic Museum, and collections and portions of collections donated or loaned by other collectors such as Dwight D. Eisenhower, Jascha Heifetz, and General Matthew Ridgway. Its principal mission is to allow learning of diversity, history, and geography through its philatelic exhibits, library, resource center, and programs for children.

http://en.wikipedia.org/wiki/Spellman_Museum_of_Stamps_%26_Postal_History