There isn't a major city in North America, I think, that doesn't have them--sightseeing buses, that is. They differ from place to place, of course, from the amphibious Ducks in Seattle to the open-topped double-deckers and repurposed London Routemasters of Toronto and Vancouver, but go down a main street on any given day and you'll be as likely as not to find one of them rambling along, creaking with tourists snapping photos of the city as it goes by.
Personally, I've never been interested in "tourist experiences" like these--when I'm off in another city, I prefer to do things that don't scream "hey everyone, I am a stranger to these here parts." I do, however, make it a point to take photos of these tour buses as they go by. I mean, I'd probably show up in a bunch of their pictures anyway. I'm only returning the favor.
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