United States Post Office and Sub-Treasury Building (Boston) ca 1900
A photo of the United States Post Office and Sub-Treasury Building, in Post Office Square, Boston. This structure gave the square its name.
Detroit Publishing Co.
Wikimedia Commons. https://commons.wikimedia.org/wiki/File:United_States_Post_Office_and_Sub-Treasury_Building_(Boston)_ca_1900_4a07553a.jpg
1900
Nathan Cummings
Public domain