If you have used the DNA testing and found out where your roots are, you can then find postcards that connect you with your past. Historically speaking, you can find many postcards from your birthplace or where you live now.
Perhaps this postcard of Massachusetts General Hospital in Boston was your birth place.
Perhaps you went to Muhlenberg College, Allentown, Pa
Perhaps you just love historical building architecture, like these.
I have a postcard display and change it with each holiday.
In any case, you will find almost 3000 post cards with ever subject and every holiday.
Check out these great postcards under the Paper Ephemera category and the subcategory Postcards.