St. Paul's Lutheran Church is Bill's fortified home and armory in Lincoln, and the base you visit in the Safehouse section of Bill's Town. Bill gives Joel a shotgun and nail bombs here before the group heads out through the graveyard.
Bill sleeps here and stockpiles parts, supplements and weapons gathered from around town. He trades from the church with Boston smugglers, including Joel and Tess. Clickers still roam the graveyard next door, and the pair burned infected bodies outside.
Joel and Ellie reach the church with Bill through a back entrance, restock and pick up the shotgun and nail bombs. From here the route leads into the graveyard and on toward the high school.