Burgruine Granegg, Castle ruin in Egesheim, Germany

Burgruine Granegg, also called Michelstein, is a rock castle ruin on the Schlossfelsen at 921 m above sea level west of Egesheim. Surviving are remains of rubble and bossed ashlar walls and part of the bergfried, the main tower. The castle was built in the 11th century by the lords of Michelstein and first mentioned in 1102.

The site was first recorded in 1102 as a fortress for the Michelstein lords. An earthquake damaged the structure in 1356, and forces from Rottweil destroyed it in 1377.

The name Granegg comes from the Ifflinger von Granegg family, who held the castle as a fief from 1536 to 1792; before that it was called Michelstein, a name used until the 16th century. The surviving walls are of rubble and bossed ashlar masonry, and part of the bergfried still stands. The Schwäbischer Albverein has looked after the ruin since 1931.

The site sits on elevated terrain and is best reached on foot, with a walk from the village of Egesheim recommended. The Swabian Alb Association has maintained the ruins since 1931, keeping them accessible to visitors.

The name Michelstein was used until the 16th century; the second name comes from the Ifflinger von Granegg, who held the fief from 1536 to 1792. In 1792 Karl-Alexander sold the ruin with his Fridingen property for 95,000 gulden to Emanuel and Michael Levi of Hechingen, and Karl von Ifflinger bought it back in 1831.