This couple visited all the Post Offices in the Pine Tree State
From the article: "...Maine has more than 400 Post Offices — and Al D’Andrea and Margit Ahlin have been to each one.
The married couple’s trek began in 2010 after USPS released a stamp honoring artist Winslow Homer.
The Maine residents, who are stamp and postmark collectors, were near Prouts Neck, a coastal peninsula in Scarborough, where Homer painted. ..."
Article Reference: usps.com