British Postal Museum - Britain's main postal museum - comprehensive. Their exhibitions change regularly and there is a host of historical information in the form of PDF documents on the web site itself. Too much to list here!
Italian Postal History - If you can speak Italian, you'll have no problems
Bath postal museum - Colourful, frequently changing exhibitions, interactive games and quizzes, models and collectables and feature historic ‘talking heads' video characters. There is also plenty to do for young visitors, who can play the mail computer challenge, try on costumes and play our stunning ‘Potholes and Pitfalls' board game. All visitors are also provided with the opportunity to perforate their own sheet of stamps and museum shop offers a large range of postcards and gifts to complement the historical feel. Also stock items for the serious philatelist and would-be collector.
Isle Of Wight Postal Museum - Probably the largest private collection of post boxes and postal equipment in the United Kingdom (possibly in the world). The Museum is situated near Newport, in the paddock of an old house. The collection has been acquired over many years and had grown to the point where it required a home of it's own to protect it from damage and to allow the display of the material.
Canadian Postal Museum - Founded in 1971 and opened in 1974, the National Postal Museum joined the Canadian Museum of Civilization in 1988. In 1996, the name changed to Canadian Postal Museum (CPM). The Canadian Postal Museum operates a complete museum programme and acts as a repository to hold objects in trust for the Canadian public. Its mission is to preserve and interpret the material heritage of postal communication within the context of global and societal communications, especially, but not exclusively, in Canada.
Black Country Living Museum - Not specifically postal related, but you'll always find a postman on site, dressed as he would have been in the early 1900's - well worth a visit.
Czechoslovakian Postal Museum - Founded on 18 December 1918 and located in Prague. Just a few weeks earlier, on 28 October, with the ending of the First World War, new European states were created taking the place of former Austria-Hungary, one of which was Czechoslovakia.