The Malakoffturm marks the southwest corner of the curtain wall around the Ober-Ingelheim castle church.
In 1856, the former Alte Wache was renamed and has been called the Malakoffturm since then. The reason was - in the abbreviated version - the storming of the Malakov bastion in the Crimean War (1853-1856) by the Allies. The victory ended the war and as a result massive, large towers were given the name Malakoff throughout Western Europe.
From the 19 meter high tower you have a nice view over the roofs of Ingelheim over to the Westerberg with the Bismarck tower and to the west towards the Rheingau. The "fear hole" was the only entrance and exit to the cellar dungeon.