St. Johannes der Täufer

The building is a clearly defined, cuboid hall, alongside which stands a very slender bell stele as a campanile, connected to the main building only by a small vestibule. The strongly and evenly folded roofscape terminates on the long sides in eight shallow zigzag gables each, contoured by projecting gargoyles. A broad band of windows on a low base structures the exposed-concrete walls, while the wall above remains completely closed up to the roof edge.

The vividly coloured band of windows designed by Böhm also serves as a Stations of the Cross; the stained glass was executed by Peter Winnen, and the wrought sculptures were designed by Hans Lückerath. A cross is modelled into the altar wall, on which hangs a crucifix figure roughly 103 cm high dating from around 1410, which before the Second World War was mounted in the nurses' residence of the clinics. The tabernacle was designed by Eva Burgeff-Kerkoff, while the ambo and font come from Böhm himself; the bronze font was made in 1965 at the Kölner Werkschulen.

In 2006/2007, an elaborate concrete restoration became necessary, during which the grain of the original exposed concrete was reproduced as precisely as possible at the patched areas. In 2007, a small medicinal herb garden was laid out north of the church, in which a broken column commemorates those who left their bodies to medical research after death. In art-historical terms, the building is regarded as a transitional work of Böhm's, connecting the clear geometry of his early work with the sculptural ceilings of his later principal works.