I've always loved riding mass transit; how much nicer to read a book or people watch while traveling than it is to pay attention to the road?
In Portland, Oregon, I particularly enjoyed riding their light rail, the MAX. One of the more enjoyable parts was the inclusion of art amongst the advertising panels. Almost every train had at least one poem up somewhere on the walls. Here, I share one I found this evening while browsing through some old photos. If you can't read it at this size, you can click through to my flickr page, and it should be readable there.