This year, Guimarães and Maribor (Slovenia) are the European Capitals of Culture and the portuguese post service issued a stamp to celebrate the event. Manú sent me a maxicard with that stamp and matching postmark.
The European Capital of Culture is a city designated by the European Union for a period of one calendar year during which it organises a series of cultural events with a strong European dimension.
Preparing a European Capital of Culture can be an opportunity for the city to generate considerable cultural, social and economic benefits and it can help foster urban regeneration, change the city's image and raise its visibility and profile on an international scale. - in: wikipedia