Inside of Bird Cage Postcards Inside of Bird Cage No. 2452 Postcard. Caption on front: Inside of Bird Cage, Franklin Park, Boston, Mass. Postally unused. On verso: Pub. by Mason Bros. & Co. Facebook Twitter Print Friendly Skills Bird cage, Dorchester, Franklin Park Posted on December 7, 2022 ← Bear Pit, Franklin Park Zoo Bird House, Franklin Park Zoo →