By Louis Sullivan, built 1903, Russian Revival architecture.
Holy Trinity Orthodox Cathedral is the cathedral church of the Orthodox Church in America Diocese of the Midwest. It is one of only two churches designed by Louis Sullivan, one of the seminal architects of the late 19th and early 20th centuries. It is listed on the US National Register of Historic Places and is designated a Chicago Landmark.
From Wikipedia, CC BY-SA 4.0.
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