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All You Need to Know About Opening Day 2026 at Longfellow House–Washington's Headquarters National Historic Site Mark your calendar! Opening Day 2026 at Longfellow House–Washington's Headquarters National Historic Site in Cambridge, MA, is set to welcome visitors back with a full slate of immersive experiences. This landmark is known for its significant roles as both the home of famed poet Henry Wadsworth Longfellow and as General George Washington’s headquarters during the American Revolution. On Opening Day, expect expertly guided tours through the richly decorated rooms and lush gardens, which trace America’s journey from its founding era. Families can engage in special kid-friendly activities designed to spark curiosity and discovery, while history lovers will appreciate newly featured exhibits. The atmosphere at this event is enthusiastic and inviting, making it ideal for visitors of all ages. Whether you’re revisiting or discovering the site for the first time, Opening Day promises a captivating journey into Cambridge’s past.