Here is someone who walked every street in Manhattan:
<a href="http:&#x2F;&#x2F;linkage.cpmc.columbia.edu&#x2F;Manhattan_Walk&#x2F;Walk.html" rel="nofollow">http:&#x2F;&#x2F;linkage.cpmc.columbia.edu&#x2F;Manhattan_Walk&#x2F;Walk.html</a>