No map. No GPS. No breadcrumbs. No ball of yarn. I just kept going for hours, turning and weaving and continually coming upon mini stone hallways just like this. If I thought I shouldn't go down one, I immediately headed toward it. And once I came out the other side, getting more and more disoriented, the happier I became. You can do this in Venice for hours on end, possibly days I've been told, and never see the same place twice. So I just kept going . . .