Bear Pit, Franklin Park Zoo Postcards Bear Pit, Franklin Park Zoo No. 2451 Postcard. Caption on front: Bear Pit, Franklin Park Zoo, Boston, Mass. Postmark unreadable. On verso: Published by Mason Bros. & Co., Boston, Mass. Made in U.S.A. Facebook Twitter Print Friendly Skills Bear Pit, Dorchester, Franklin Park Posted on December 7, 2022 ← Police Station and Library, Lower Mills Inside of Bird Cage →