Congregationalism is a Protestant, Reformed (Calvinist) tradition in which churches practice congregational government; where each congregation independently and autonomously runs its own affairs.
Iglesia Evangelica Congregacional, Coronel Du Graty, Argentina
St Michael's Church in Melbourne
The American College of Sofia was founded by Congregationalists
The Puritans were English Protestants in the 16th and 17th centuries who sought to rid the Church of England of what they considered to be Roman Catholic practices, maintaining that the Church of England had not been fully reformed and should become more Protestant. Puritanism played a significant role in English and early American history, especially during the Protectorate.
The Westminster Assembly, which saw disputes on Church polity in England (Victorian history painting by John Rogers Herbert).
Interior of the Old Ship Church, a Puritan meetinghouse in Hingham, Massachusetts. Puritans were Calvinists, so their churches were unadorned and plain.
Death's head, Granary Burying Ground. A typical example of early Funerary art in Puritan New England