Sankt Sakrament, Brutalist church in Heerdt, Germany

Sankt Sakrament is a church building in Heerdt featuring thick concrete walls and bold brutalist design from the 1940s. Inside, a large marble baptismal font for immersion and an organ with 13 ranks across two manuals and pedals define the interior.

The building was constructed in 1940 as an air raid shelter to protect people during World War II. After the war, the structure was transformed into a place of worship and has served religious communities since then.

Since 2015 the church has belonged to Düsseldorf's Coptic Orthodox community, which finances it through donations and serves about 700 Coptic families from the city and its surroundings. A wooden iconostasis separates the altar area from the nave, and a deep marble baptismal font allows full-body immersion; the old font now stands in the entrance. Pope Tawadros II consecrated the church on 12 May 2019.

The church stands at Heerdter Landstraße 270, corner of Kevelaerer Straße, facing Pastor-Klinkhammer-Platz; the Handweiser stop of tram line U75 linking Düsseldorf and Neuss main stations is next to it. The nave is 35 m long and 9 m high, entered through the dark porch below the facade crucifix. The tower and cellar keep their original bunker state.

The whole church is the bunker: a four-storey LS 13 air-raid shelter built 1941-1942 to hold about 2,300 people, disguised as a church for camouflage. Its two-metre-thick intermediate ceilings were blasted out in 1947-1949, while the cellar and tower keep their original state. The parish priest Carl Klinkhammer lived in a flat inside the bunker until his death in 1997.