The Eastern Promenade (Eastern Prom) is a historic promenade, 68.2-acre (27.6 ha) public park and recreation area in Portland, Maine. Construction of the Promenade began in 1836 and continued periodically until 1934. The 1.5-mile (2.4 km) park was designed by the Olmsted Brothers design firm and experienced its greatest expansion from the 1880s to the 1910s. The Promenade rings around the Munjoy Hill neighborhood and occupies the farthest eastern portion of Portland's peninsula. The Promenade is home to many historical sites, including a mass grave and the mast of USS Portland.