Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Freethinkers' Hall - Freethinkers' Hall also known as Park Hall is a meeting hall in Sauk City Wisconsin. Designed by Alfred Clas Freethinkers' Hall was built in 1884 for the local Freethinkers' congregation or Freie Gemeinde. The congregation had been formed by German immigrants in 1852 and became the last extant Freethinker' congregation in North America. It affiliated with the American Unitarian Association in 1955. The group meets in the hall to this day.
A:
Building