Gillette Castle State Park

East Haddam, CT

Gillette Castle State Park
• Address: 67 River Rd, East Haddam, CT 06423
• State: Connecticut
• Website: portal.ct.gov/DEEP

Overview:
Perched high above the Connecticut River, Gillette Castle State Park draws over 300,000 visitors a year—and it’s easy to see why. This quirky 14,000-square-foot stone mansion was built in 1914 by William Gillette, the actor best known for his stage portrayal of Sherlock Holmes. From its dramatic hilltop location to the hidden passageways, hand-carved locks, and unusual design choices, the castle feels more like a mystery novel brought to life. The surrounding park offers forest trails, scenic overlooks, a seasonal ferry crossing, and even a few rare riverfront camping spots.

Why It’s Worth a Stop:
Between the theatrical architecture, the Sherlock Holmes lore, and the incredible river views, this spot checks a lot of boxes. Hike the wooded trails along the old miniature train bed, enjoy a picnic, or take a self-guided tour of the castle itself—just be sure to book in advance. It’s weird, wonderful, and wholly unforgettable.

What to Know Before You Go:
• Park grounds open daily from 8 a.m. to sunset year-round.
• Castle interior is open for self-guided tours Memorial Day through Labor Day (daily) and on weekends/holidays through mid-December.
• Holiday tours offered on weekends between Thanksgiving and Christmas.
• Castle admission: $6 adults, $2 kids (ages 6–12), free under 5.
• Grounds and trails are free to visit.
• Pets allowed on leash in picnic areas and trails (not in the castle or on decks).
• Restrooms, picnic tables, and parking available.
• Castle first floor is wheelchair accessible.

Fun Fact:
Gillette’s will requested that the property never fall into the hands of “some blithering saphead who has no conception of where he is or with what surrounded.” The State of Connecticut got the message—and preserved the place with care.