The Boston Common (often but not always used without the) is a central public park in Boston, Massachusetts. It is sometimes erroneously referred to as the Boston Commons. Dating from 1634, it is one of the oldest city parks in the United States. The oldest park in the United States is the Plaza de la Constitucion, established by Spanish law in 1573 in St. Augustine, Florida. The Boston Common consists of 50 acres (20 ha) of land bounded by Tremont Street, Park Street, Beacon Street, Charles Street, and Boylston Street. The Common is part of the Emerald Necklace of parks and parkways that extend from the Common south to Franklin Park in Roxbury. A visitors' center for all of Boston is on the Tremont Street side of the park.