Gillette Castle State Park
No admission feeTour actor William Gillette's fieldstone castle above the Connecticut River and hike the path of his miniature railroad.

Photo: Kevinpepin, CC BY 3.0, via Wikimedia Commons. Cropped and resized.
A Connecticut state park known for its waterfall, cylindrical potholes in the rock, birding, and fishing on the Eight Mile River.
366 Hopyard Rd. East Haddam, CT 06423 · East Haddam, CT
Devil's Hopyard State Park sits on the Eightmile River near Chapman Falls in East Haddam. Visitors can hike to waterfall overlooks, watch birds, and fish in the clear, cool river. The park's round potholes carved into the stone are a major draw, and the official park page notes that early settlers told a folk tale about the Devil to explain them, while geologists attribute them to swirling stones in an eddy. The park also offers biking, camping, and picnicking, including a campground near the falls.
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