I suggest if they want to seek activity, they simply go where it is, stop investigating grandmas abode
I've seen shows where they go to Gettysburg. I think I even saw one where they went to Pearl Harbor. So, sometimes they go to places that are more than just the bar where a guy killed himself in the 1800s.
Maybe they don't go to ground zero at Hiroshima and Nagasaki because they Japanese government won't let them perhaps?

