Mailboxes for floating homes at dock called The Old Boathouse, just east of south end of the Aurora Bridge (George Washington Memorial Bridge), Seattle, Washington. (Floating homes and shanties on pilings, houseboat community at the north end of the bridge.)
<a href="//commons.wikimedia.org/wiki/User:Jmabel" title="User:Jmabel">Joe Mabel</a>
CC BY-SA 3.0
Photo by <a href="//commons.wikimedia.org/wiki/User:Jmabel" title="User:Jmabel">Joe Mabel</a>