Down an unassuming alley beneath Pike Place Market there's a wall covered in years' worth of chewing gum. It's a visitor's tradition to "leave a mark" on the Gum Wall. Interesting (and gross) as that is, the bigger draw of that odd region of the city is the Market Theatre, a local institution that hosts of number of small but entertaining shows, such as the long-running Theater Sports improv comedy performance frequented by students and travelers. Seattle has its fair share of theater, and a lot of it looks like that. It's not big, it's not flashy and it won't be traveling around the country. It's a stage show for locals or to introduce visitors to the way live performance works in the city.