St. Martin's Catholic Church and Grotto is a historic church complex located at 612 Main St in Oelrichs, South Dakota.

It features Late 19th and Early 20th Century American Movement architecture and was added to the National Register of Historic Places in 2005.

[2] The grotto was built by Father Gerhard Stakemeir and Nick Bogner, a parishioner, in 1932–1934.

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