In 1849, most of Public Square and buildings on three adjacent streets were destroyed by fire. The square was immediately rebuilt. Several buildings erected during the rebuilding still stand. In the rebuilding of the 1850s, the city created three parks at the square's center, with a fountain inside the center park. During Watertown's industrial boom in the late 19th and early 20th centuries, Public Square became the heart of Watertown's retail, business and social life. In the 1950s, the three parks in the square's center were combined into one large park.