sorry there is no url, you have to download google earth wich is free , then you can go to any major town or city in the world and virtually walk around the streets.
i just took a walk down to the exorcist house on prospect st , but the funny thing is that i have never been to america ,how did i do it ? google steet view, it was quite impressive as you get a 360 view, you can even stand at the top of the exorcist steps , not bad for someone who lives in the uk, plus it was nice sunny day, check it out.