Which of the following locations is it illegal to carry a concealed firearm in Massachusetts, even with a valid license?

Carrying a concealed firearm in schools is illegal in Massachusetts, even with a valid license. This is because schools are considered to be sensitive areas where the presence of firearms could greatly endanger the safety of students and staff. State parks, banks, and private businesses that permit firearms are not explicitly prohibited in Massachusetts, although individual establishments may have their own policies regarding firearms.