The City of the Immaculate  - Late 1920s to 1940s 

In 1927, a Polish Prince gave him land at Teresin, near Warsaw, where he built a monastery, called Niepokalanow, or “City of the Immaculate”.  Assisted by several other friars, he worked hard to clear the forest and build a chapel, college, novitiate, friary, hospital and electric plant.  Here he could house all the facilities needed to publish the increasingly successful “Knight of the Immaculate” and the eight other associated publications, including "The Little Daily" and "The Sporting Journal".  At one point, more than 750,000 copies were distributed per month.

He returned from his missionary work in 1936, due to his ailing health. The monastery in Poland, though, continued to blossom under his guidance and in 1939 was the largest monastery in the world and completely self-sufficient, with its own radio station, medical facilities and fire brigade manned by some of the more than 800 people who lived there.  Kolbe even had plans to construct a small airport, however this idea was never to take form, as the Nazis invaded Poland in 1939.