The Isabella Stewart Gardner Museum writes:

“We are deeply saddened by the tragic events that took place at the Boston Marathon yesterday. Our thoughts go out to all those impacted. Understanding that museums can provide solace and peace during hardship, we would like to extend free admission on Wednesday, April 17th.”

The Museum is open from 11-5pm and is located at 280 The Fenway, Boston, MA 02115. More information can be found here.