The Polish Post Museum is situated in an impressive multi-storey Romanesque-Revival building erected in the 1st half of the 20th century. In 1920, when the decisions of the Treaty of Versailles came into force, the organisation of the Polish post service in Gdańsk began. As a result, on 5 January 1925, the no.3 Polish Post and Telegraph Office (later changed to no.1), was established in the building where the museum is now situated. The museum, which was founded on 1 September 1979, on the 40th anniversary of the outbreak of the Second World War, tells the story of the Polish post offices and of the Polish community in Gdańsk between 1920 and 1939. The culminating point of the narrative is the story of 1 September 1939, when at 04:45 the no.1 Polish Post and Telegraph Office was attacked by German forces.

The museum’s exhibition presents a number of unique prints and manuscripts, as well as iconographic material and exhibits connected with the defense of the post office and the defenders themselves. Visitors can see a copy of the plan of attack on the post office drawn up by the German forces on 3 July 1939 and one of the ten post boxes, which were installed on the buildings belonging to Polish authorities, offices and institutions and Polish citizens. The postmaster’s room, which has been reconstructed, can also be visited, and it is possible to see the Hughes telegraph. The Museum collects and presents objects and memorabilia related to Polish professional, cultural, educational and sports organisations, which aimed to keep the Polish spirit alive and evoke the nation’s identity in the Free City of Gdańsk.