Gillette Castle State Park — RV Camping in Connecticut, US

Gillette Castle State Park sits on 184 scenic acres above the Connecticut River in East Haddam, Connecticut, offering a one-of-a-kind camping and outdoor destination in the Connecticut River Valley. The park's crown jewel is a dramatic 24-room stone castle built between 1914 and 1919 by actor William Gillette, celebrated for his portrayal of Sherlock Holmes. Perched 200 feet above the river, the castle offers self-guided tours showcasing hand-carved woodwork, 47 uniquely designed doors, and fascinating historical artifacts. Camping here is a true backcountry experience: a single primitive riverside campsite accommodates up to 20 guests and is accessible only by canoe or kayak, making it perfect for paddlers seeking a secluded overnight adventure. Day visitors enjoy hiking trails that follow a former narrow-gauge railroad route, complete with footbridges, trestles, and a 75-foot tunnel. Picnic areas at the historic converted train station pavilion overlook the Connecticut River, and fishing access is available along the waterfront. Pets are welcome on leash in picnic and trail areas. Nearby attractions include the Chester-Hadlyme Ferry, Devil's Hopyard State Park, and the acclaimed Goodspeed Opera House, rounding out a rich cultural and natural experience in central Connecticut.