Walking videos on Youtube! The good ones are high quality, stabilized, and don't have any commentary. Very relaxing to watch and you get a nice closeup view of another city. Here's one of my favorite channels: https://www.youtube.com/user/Rambalac
I like watching them while exercising, and they also serve well as ambient background noise while you work. I'm partial to Japan but there are similar channels and videos for just about every major city. Here are a couple others I found just now:
The keywords to look for are "video walk", "virtual tour", etc. If you do prefer to have commentary like a tour guide, I'm sure there are videos with that too.
Does anyone know if there is someting similar at Vimeo?