On this docent-led tour you’ll hear the fascinating story of how Frederick Law Olmsted transformed a fouled mudflat into a scenic Fens and the 20th century revisions that created the parkland we see today. This tour is free and open to the public. Wear walking shoes and bring a refillable water bottle. Tours are cancelled for rain or extreme weather. Check website www.emeraldnecklace.org for updates or call 617-522-2700.