Mauersechseck, Medieval archaeological site in Dossenheim, Germany.

Mauersechseck is a medieval fortified residence in Dossenheim with the ground remains of a hexagonal structure. The ruins sit on the western slope of Hoher Nistler mountain at about 255 meters elevation, with walls barely rising above ground level.

The site was discovered in 1932 and excavated the same year, when walls stood over a metre high in places. The tower house was first dated to the 11th century; the surrounding wall and use as a fortified manor were placed in the second half of the 14th century. It was probably the seat of a minor noble dependent on the Schauenburg and was abandoned without signs of fighting, possibly around 1420/31.

The name Mauersechseck comes from the irregular hexagonal outer wall; old forest maps of 1790 and 1841 label the spot "(Die) Einsiedel". A bronze ring found here bears the Latin inscription S. ANTONIVS HJUTAME, read as S. ANTONIUS ADJUTA ME, "Saint Anthony, help me". Decorated stove tiles of the Tannenberg type, made in Dieburg, show the small residence had at least two high-quality tiled stoves.

The wall remains lie in the Wolfsgrund wood on the Dossenheim side of the boundary with Heidelberg-Handschuhsheim, at about 255 m elevation on the flattened west slope of the Hohen Nistler. A broad forest path passes to the east and north, but dense undergrowth along it hides the ruin, so look for the low stones off the path. The Drei Eichen are reached northeast via a hiking trail; the Leferenz quarry begins a few dozen metres north.

Among the metal finds were at least one axe, knife remains, a sickle, two drills, a Gothic key, a file and parts of a horse bit, plus remains of horseshoes probably for mules or donkeys. A stone cross was also found, possibly an atonement cross, though no building part could be assigned to a chapel.