The Mall, a quadruple row of American elms, is Central Park's most important horticultural feature, and one of the largest and last remaining stands of American Elm trees in North America. The lower end of the Mall is known informally as Literary Walk or Poets’ Walk, as four of the five statues memorialize poets and writers: William Shakespeare (1870), Robert Burns (ca. 1880), Sir Walter Scott (1871), and Fitz-Greene Halleck (1876); the fifth represents Christopher Columbus (1892).