Seventh Sister

67 River Rd., East Haddam, Connecticut. County/parish: Middlesex.

Added to the National Register of Historic Places July 31, 1986. NRIS 86002103.

4 contributing buildings.

From Wikipedia:

Gillette Castle State Park

Gillette Castle State Park straddles the towns of East Haddam and Lyme, Connecticut in the United States, sitting high above the Connecticut River. The castle was designed and built by William Gillette (1853–1937), an American actor most famous for his portrayal of Sherlock Holmes on stage. Gillette lived here from 1919 until his death in 1937. The State of Connecticut purchased the property in 1943 for $29,000.

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National Park Service documentation: https://catalog.archives.gov/id/132355162

LC