The USS Cassin Young (DD‑793), a Fletcher‑class destroyer, is not in Charlestown, Massachusetts (home of the USS Constitution).
Buffalo and Erie County Naval & Military Park
1 Naval Park Cove
Buffalo, New York 14202
If you're in Boston, visit the USS Constitution and USS Cassin Young's namesake, Commander Cassin Young (Medal of Honor, Pearl Harbor), is honored at the Naval Academy. But the ship itself is in Buffalo.