The main drag outside this former general store in the homey waterfront community of Havre de Grace — a short hop off U.S. 40 north of Baltimore — is drenched in Americana.
Antiques shops and local art galleries dominate the street, clustered behind kitschy window displays of knickknacks. A sign advertising a summer seafood festival is posted outside an independent bookstore.
But at the back of Mary Martin's downtown shop, you'll discover a far wider world, collated in an assortment of postcards, some featuring nearby small towns but many others far-flung foreign cities.
This is the "world's largest" postcard collection of Mary L....