The Herz-Jesu-Kirche was built by Ludwig Becker in Gothic Revival architecture as a memorial of Bishop Wilhelm Emmanuel Freiherr von Ketteler in the largest working class district of Mainz.
Above the crossing is an eight-sided ridge turret with an idiosyncratically shaped copper pointed helmet with a crowning figure of the Sacred Heart of Jesus.
The sacred building, dominating the townscape, is typical of the late historian Becker's striving for monumentality of appearance.
The modern glass windows by Alois Blum, Mainz, impress especially in contrast with the equally high-quality neo-Gothic style.
The large abstract wooden cross of cubes and ashlars, originally by Alois Plum, was given a corpus with a baroque corona later.
Carved by the Mombacher citizen Jupp Schmitt from the wood of a lime tree that stood in the parish garden of St. Nilolaus.