D.C. tourist baseball pins
 

I was born and raised in Washington, have lived there or vicinity most of my life, so I started picking these up long ago when I would see them. Now it's a subset of my collection! I'd be interested to see if these were done for any other cities or are unique to the Nation's Capitol and it's tourist influx in the summertime. I've also wondered if they were sold at the ballpark or in tourist locations in the city, the greater likelihood I would think.