http://www.seltzerslebanonbologna.com/
The Seltzer family “secret” Lebanon Bologna recipe starts with fresh, premium quality, lean beef. After the addition of a special blend of savory spices and seasonings, the bologna is naturally smoked in outdoor wooden smokehouses and slow-cured over hand-tended hardwood fires. The smokehouses – ten in all, each standing 30 feet tall – are constructed entirely of wood and built in the original 1902 design. It is the slow-smoking method that gives Lebanon Bologna its distinctive taste. Walking among the smokehouses, a visitor will feel as if they have been transported back in time to a bygone era.

I think Dirty Jobs did an episode there now that I think about it.