Niepokalanów monastery (so called City of the Immaculate Mother of God) is a Roman Catholic religious community situated in Teresin (near the Warsaw-Łowicz railway line, about 42 km to the west from the capital of Poland).

[1] In summer 1927 duke Jan Drucki-Lubecki, the owner of a large estate located in Teresin village, offered fr.

In 1930 father Kolbe founded a similar community in Nagasaki (Japan), called Mugenzai no Sono (無原罪の園: Garden of the Immaculate).

[5] This department, equipped with some basic tools such as hand pumps, a homemade water tanker, ladders and hooks, was responsible for ensuring fire safety for the monastery's wooden residential and publishing buildings, as well as paper storage areas.

For example, at the turn of 1939/1940, a group of approximately 1500 Jews, displaced from Greater Poland, stayed in Niepokalanów for several months, and the friars provided them with care.

Father Maximilian Kolbe, together with four other friars, was arrested by the Gestapo and he was murdered in Auschwitz concentration camp in august 1941 when he chose to sacrifice his life so another prisoner could live.

[3] During the Warsaw Uprising, the monastery became a refuge for the wounded members of Polish resistance, homeless families, and war orphans.

In the end of the war (January 1945) during heavy bombardment of Niepokalanów, six friars were killed, some others injured and many of the buildings of the monastery were destroyed.

The Knight of the Immaculate was issued again, as also some books, dedicated to St Maximilian (e.g. Dwie Korony [Two Crowns] by Gustaw Morcinek).

[2] John Paul II called the monastery a heroic place where saint Maximilian lived and the environment of the Immaculate.

Located in the southern wing of the basilica, it was opened to the public in September 2018, marking the 79th anniversary of the outbreak of World War II.