Gut Kalkofen, Manor estate in Aachen, Germany.

Gut Kalkofen is a former four-winged moated manor in Aachen's Nordviertel, now about half open on its north side. Its core dates from the 15th and 16th centuries, with gun ports, remnants of a water-filled moat on the south and west, and three of four round corner towers; the west tower has two-metre-thick walls. A three-storey gate tower with a two-arched stone bridge (1750) gives access, and the southwest wing holds the two-storey late-Baroque manor house with mansard roof.

Gut Kalkofen was first recorded in 1305 as the property of Aachen mayor Arnold von Kalkofen; a gap in documentation ends on 27 March 1437, when it appears in the marriage contract of Adam von Haren and Agnes von dem Weyer. In 1582 the estate was set on fire and afterwards rebuilt. From 1750 to 1753 the Aachen cloth manufacturer Johann von Wespien had it rebuilt as a pleasure palace by Johann Joseph Couven; in 1831 it passed to the Zurhelle family, which still owns it.

The gate tower bears the alliance coat of arms of mayor Johann von Wespien and his wife Anna Maria Schmitz, the builders of the 1750s gate. Above the tower window is an empty saint's niche, and the baroque tower dome with clock gable was replaced after World War II by a flat tiled pyramid roof.

As private property, the grounds are not open to the public but can be viewed from outside the boundaries. Its location near the highway junction and city edge means travelers can spot it during a drive through Aachen.

The gate tower's keystone area carries the alliance coat of arms of mayor Johann von Wespien and his wife Anna Maria Schmitz, identifying the couple who built it. Above the tower window is an empty saint's niche. The baroque tower dome with clock gable and lantern was replaced after World War II by a flat pyramid roof of pantiles.