Don't have to be particularly obscure cities to get a lot of segments. I once had to take a last minute flight from Cape Town to Seattle (before the direct Jo-burg to Atlanta route existed).

Cape Town > Johannesburg > Amsterdam > Atlanta > Seattle.

4 segments... and about 40 hours... gooooooood times :)

BA flies Cape Town -> Heathrow. From there we went on direct to SFO but I'd be surprised if you can't get to SEA from there.