There is a Civil War era cannonball in the wall of the Greeneville Cumberland Presbyterian Church in Greeneville, Tennessee (Presbytery of East Tennessee). Stories about the “Greeneville Cannonball” seem to come around about once a decade as each new generation “discovers” the controversial artifact. The Reverend Walter Chestnut, an accomplished Cumberland Presbyterian historian with ties to the Greeneville church always maintained the cannonball was deliberately placed in the wall of the church in around 1936 in order to create a talking point. At any rate, here is the latest exploration of the topic from the Greeneville Sun:

https://www.greenevillesun.com/news/local_news/massey-the-greeneville-cannonball-mystery/article_1a3ef066-c8c3-5b65-ae05-59dda673891b.html