The Zion Lutheran Cemetery, Wrought-Iron Cross Site, near Mercer, North Dakota, United States, was listed on the National Register of Historic Places in 1989. It includes wrought-iron crosses. The listing included seven contributing objects.
It includes work by Carl Rennich, of Mercer. Rennich was one of a number of "German-Russian blacksmiths in central North Dakota" who developed individual styles in their crosses and whose "work was known for miles around them."