In Cincinnati, a series of catwalks connecting buildings in the downtown area.

The core run starts in the Mercantile building, and mostly parallels the blocks between Fourth and Fifth streets to the Carew Tower. It turns north to the block between Fifth and Sixth street, past Fountain Square, to the Chiquita building, where it turns south to the Atrium building, on the south side of fourth street. There are a couple of spokes to other buildings.

The big advantage is that it can allow you to move quickly between points, not having to cross as many streets. It is also nice during a rain or snow, as you get to be covered. Though a bit of it is still outside, it generally is warmer during the winter.