Some people think it's gross, but I love the gum wall at Market Theater/Pike Place Market.
According to Wikipedia, theater patrons started sticking coins to the wall using gum in 1993. Theater workers removed it a couple of times, but stopped trying after market officials decided that the wall was a tourist attraction.
The gum wall is a great place for photos. I took these with my old Kodak a couple of years ago.
I think it's time to get some photos of Nathaniel in front of one of "the world's germiest attractions."