Cheers to Count Casimir!
Yes, Mettenheim had a castle; and a residential castle at that! It no longer exists, but there are many other historic buildings in the town center. Half-timbered houses, baroque church, count's rent office (chancellery and administration building) were built by count Johann Kasimir Kolb von Wartenberg. From 1709 Mettenheim became the property of the counts of Wartenberg. The site name refers to a castle built in 1726. Mettenheim is located on the beautiful Rhine terrace. Hikers discover this region best via RheinTerrassenWeg. In the middle of the location, the small lookout point "Odenwaldblick" with a bench invites you to take a rest (not covered). If you are looking for protection from the rain or a shady spot, you can use the roofed cycling and hiking hut. A variety of grape varieties thrives on fertile loess.
> RheinTerrasenWeg, Osthofen-Bechtheim-Mettenheim and Mettenheim-Alsheim-Guntersblum stages. The Hohlwege also begin at Mettenheim. https://www.rheinhessen.de/etappenvorschlaege/0
> More historical information about Mettenheim and its residential castle: https://www.regionalgeschichte.net/rheinhessen/mettenheim.html
> Other locations related to castles: Niersteiner Schloss Schwabsburg, Herrnsheimer Schloss or Saulheimer Schlossberg.