Savannah's historic district was designated a national historic landmark in 1966; many of its 18th- and 19th-century homes have been restored. Despite devastating fires in 1796 and 1820, many old buildings have survived, including the Pirates' House (1754), an old seaman's inn mentioned in Stevenson's Treasure Island ; the Herb House (1734), the oldest existing building in Georgia; and the Pink House (1789), site of Georgia's first bank. The mansion birthplace of Juliette Gordon Low (built 1819–21) is owned and operated by the Girl Scouts of the U.S.A. as a memorial to their founder. The monument and grave of Nathanael Greene are in Johnson Square. The many churches include the Lutheran Church of Ascension (dating from 1741); the Independent Presbyterian Church (1890s), a replica of an earlier church destroyed by fire and the scene of Woodrow Wilson's marriage to Ellen Axson; and the Cathedral of St. John the Baptist (1876), one of the largest Roman Catholic churches in the South.