When Dwight Moody arrived in Chicago from Boston in 1856, he was a humble shoe salesman who felt a religious calling. He founded a school on the North Side that quickly grew to be one of the largest Sunday schools in the country. Today, the school is not just for children, but also for adults seeking to study the Bible, many of whom plan on becoming missionaries throughout the world. The church is fundamental in nature, but is not connected to any particular sect. The building that contains the school is directly across the street from the Chicago Historical Society, and is worth a look because of its unusual design. Inside, the auditorium seats 4,000 people, making it one of the largest Protestant churches in the country.