On the East Coast only the Ruby Throated Hummingbirds come and visit my garden and my feeder. However, when we winter on the Pacific Coast we often see Anna's and an occasional Rufus or Allen passes through. I would love to see a Calliope.
Yes, I have seen barred owls flying in New Hampshire.
I have also seen a Great Horned owl because I was sitting with some friends on the top of a hill that must have been close to a nest because he/she was not happy and making it clear. I would not have been able to identify the owl from seeing it at night flying but I did identify the characteristic hoot.