This granite monument was dedicated in 1830 and the relics of the Fort Griswold massacre, the house's furniture and artifacts date back to that period. In the centennial year, 1881, the top was enclosed and the monument was increased to a height of 134 feet. Free admission to the park, the Monument, Museum, or Avery House. Parking on Monument Street and Park Avenue. HOURS: Memorial Day-Labor Day, 10-5.