Nope. I was responding to Pook's "above the ground" explanation. I don't know of any ground level, fully enclosed walkways around here. There are some covered passageways, but they are open-air. Our church includes one in renovation plans, but will probably get scrapped first if funds are lacking. It is called a cloister, although that usually is attached to a wall on one side, and this one would be so in one part, but free-standing between the buildings. For the curious: cloister plan
It is also slated to be fully enclosed and heated. Then I would know of one on ground level. :0)