Johanneskirche (Cologne-Sülz)

The site sits roughly three metres below street level, so the lower storey is below grade on the entrance side but fully above ground on the other three sides. The side walls consist of a reinforced-concrete frame with fair-faced brickwork, into which prefabricated hexagonal concrete honeycombs filled with coloured cast glass are set to admit light. The altar wall is formed by two masonry surfaces meeting at an obtuse angle. The building is topped by a shallow pitched roof clad in slate, beneath which fine hardwood panels line the interior. A planned 30.5-metre bell tower was deferred due to limited funds.

Just inside the entrance, a baptistery is separated from the nave solely by glass walls, preserving a visual connection to the main space. Above it sits a gallery housing the organ and ancillary rooms, while the sacristy adjoins the nave on one side. The colourful honeycomb windows bathe the nave in direct, jewel-toned light. The door handle at the main entrance is sculpted in the form of the Evangelist John pointing to the Bible. The altar is a solid block of exposed concrete topped with a natural stone slab; above it hangs a triumphant cross of metal adorned with lead crystal and amethyst nails, bearing the inscription "I am the bread of life (John 6:35)." The organ society was founded in 1967 and the instrument completed in 1974.

Beyond regular Sunday services, the church hosts beat masses introduced by Pastor Uwe Seidel, as well as concerts by the Johanneskantorei choir. As of 2008, around 9,500 Protestants lived within the Cologne-Klettenberg congregation's area.