Burgruine Altenschönegg, Medieval castle ruin in Oberschönegg, Germany.

Burgruine Altenschönegg is a ruined lowland castle at the edge of Oberschönegg, consisting of a square 30-metre-high brick bergfried on a base of Nagelfluh stone blocks. The lower section is built of ashlar stone from the 12th or early 13th century, while the brick upper part dates from the 15th or 16th century. The tower, known as the Römerturm, is used as an observation tower.

The castle was first recorded in 1220 and belonged to the Lords of Schönegg before suffering multiple destructions through conflict. Over time, it gradually lost its role as an active fortress.

This structure served as a symbol of medieval power in the region and represented the authority of local rulers. The stone walls and remaining foundations still convey the importance this place once held.

The tower stands at the edge of Oberschönegg on the road toward Babenhausen. Its lower section is built of Nagelfluh ashlar from the 12th or early 13th century, while the brick upper part dates from the 15th or 16th century. The 30-metre tower was restored and opened as a viewing tower after 1809.

In the early 1800s, Prince Anselm Maria Fugger von Babenhausen purchased the ruins and opened them as a public viewpoint. This transformation saved the structure from further decay and gave it fresh purpose.