Roslyn, 1384 Old Northern Boulevard
Not open to the public
The Roslyn Grist Mill dates to between 1715 and 1745 and is one of the few remaining Dutch-framed Colonial commercial structures in the U.S. The property remained a working mill until the early 20th century, when it was converted to a teahouse and museum that remained in business until 1975. The following year, Nassau County acquired the mill, which is closed to the public.