Round churches are unique architectural structures characterized by their circular design. These churches were often built during the Middle Ages and served both religious and defensive purposes. The round shape allowed for better acoustics and visibility, enhancing the worship experience. One of the most famous examples of round churches is the Church of the Holy Sepulchre in Jerusalem, which is believed to be the site of Jesus' crucifixion and burial. Other notable round churches can be found in England and Denmark, showcasing the diverse styles and historical significance of this architectural form.