In the lower left of this image you can see the building that marks the entrance to the Callahan Tunnel, which was featured in my daily photo of 2/3. Here is the harbor under which the Callahan and Sumner Tunnels run. That's East Boston on the far side.
Thank you for all the comments on yesterday's H.A. Hovey photo.
BostonharborEast BostonCallahan TunnelNikon