More than fifty years after designing Unity Temple, Wright designed this building for a congregation in Wisconsin. The Greek Orthodox religion incorporates a lot of symbolism, including the Greek cross (shaped like a plus sign +). Wright incorporated the Greek cross not only into the pattern in the concrete on the outside of the building, but into the floor plan of the building itself. Four huge concrete piers help support the circular roof and form the shape of the Greek cross. The domed roof replaces the traditional dome found at the center of many Greek Orthodox churches, here becoming the entire roof instead. It is supported by an innovative system that allows small circular windows around the rim, so that it appears to be floating in the air. The interior space has worship pews around the entire circle and spiral staircases for access. Sunday school classrooms and a banquet hall are located under the structure so as not to detract from its stunning profile against the sky.

This building was designed only three years before Wright's death, and illustrates the progression of his thinking from linear to circular over the course of his career. During the 72 years he practiced architecture, he moved from reinventing the square plan towards innovative designs based on other geometric shapes like the triangle, hexagon, and finally the circle.