postage stamps of the Czech Republic and Czechoslovakia, including first day covers (FDCs), philatelic rarities and counterfeits oldest stamps of European and non-European countries, United Nations stamps specialized stamp design collections — Prague Castle, Russian gubernian parliaments, classic pre-1918 Austrian stamps, old pre-1871 German states, etc. pre-stamp letters, cancellations, first newspaper stamps in the world occasional exhibitions on stamp design and postal history library and study room with philatelic and postal history literature original mid-19th century interior of the historical building including four saloons with murals by Josef Navrátil