Seattle has an interesting, scandalous, really stinky past, especially at the beginning. If you ever get the chance, take the underground tour to learn more of the history of this city. As the tour name implies, there’s an underground city beneath the sidewalks and buildings with a life and feeling all its own. To get light down there, the businesses installed thick purple glass in the new sidewalks to give a little bit of light down below. While the underground no longer functions as a business community, the glass remains.