Maryknoll Architecture in the North of Korea
Peter Kim of Totus Tuus posts the above pictures and many more with much information from the time before this peninsula was divided — Catholic Churches in Apostolic Vicariate of Pyonyang (current North Korea). The churches pictures above seem to date from the same era as these built in California — Maryknoll Architecture. (By way of comparison, here's a newer church not far from where I live that has an inculturated "outterior" (as they say in Korea) and tabernacle — 천주교상주 화령성당.)
For more on the life of the Faith in those times, see these posts from Mr. Kim — Catholic Nuns in Korea, a Century Ago and Separate Seats for Men and Women in the Catholic Church in Korea.