Of its three views, the first can be seen when its doors are closed, a Crucifiction with a lamb holding a cross near John the Baptist.  
The sculpted portions of this work were supposedly completed by Nikolaus Hagnower.  Currently residing in the Unterlinden Museum in Colmar, it was originally executed for the hospital chapel of a monastery in Alsace.  Of its three views, the first can be seen when its doors are closed, a Crucifiction with a lamb holding a cross near John the Baptist.  When opened, the wings reveal panels with St. Paul and St. Anthony in the desert, and The Temptation of St. Anthony, while the center panel depicts the Annunciation and the Resurrection.  FTP, identify this altarpiece by Matthias Gr?newald.
The sculpted portions of this work were supposedly completed by Nikolaus Hagnower.  
Isenheim Altarpiece