In downtown Houston there is a 6-mile network of underground tunnels and second story catwalks that allow pedestrians to walk to many popular buildings without experiencing the summer heat. I often made use of these between the classes I taught at the University of Houston, not because I could not tolerate the heat, but because it allowed me to walk indefinitely without having to cross any streets. Many of these tunnels had shops, restaurants, and spaces for art, so there was...


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