| http://www.w3.org/ns/prov#value | - Special events are held year-round, including flower shows, farmers markets, cooking seminars, literary programs, art fairs and concerts.Chicago Botanic Garden Tags: Arboretums and public gardens, Walking, Gardens, Classes, Spring, Summer Ohio: The Holden Arboretum More than 20 miles of trails wind through the gardens of the 3,600-acre Holden Arboretum in Kirtland, 23 miles northeast of Cleveland.
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