I don't know how many people do this. I used to have photos from every major league ballpark I'd been to (unfortunately I don't have any from Baltimore's old Memorial Stadium...sniff) on display on my cube at work. Talk about a conversation piece...I've had people be just in awe of that. "***in' awesome", one co-worker told me.
I've since arranged them on posterboards and then frame them, with the ticket stub from each game under the ballpark. I have three framed posters, one for each league and one for parks that don't exist anymore. So in my home I have a constant reminder that I still have...let me turn around for a sec...12 more to go, seven National League and five American League. I'm going to Nationals Park this year and hopefully the new Yankee Stadium (Target in Minnesota is a long shot but I may try), but I'm not going to Miami until they get a new one.
Yes, I'm a total geek. But I'm a nice guy.