I live in Houston, and have been in the tunnels a few times. They connect a lot of the bigger office buildings downtown with a lot of assorted restaurants and f

I live in Houston, and have been in the tunnels a few times. They connect a lot of the bigger office buildings downtown with a lot of assorted restaurants and fast food. The thing is that the tunnels, and most of downtown Houston, are very business-centered, and have almost no activity outside of normal business hours. Downtown in general has been picking up some in the last few years, but activity in the tunnels is still basically nonexistent on evenings and weekends. There are some human-scale areas here with more regular activity, but they're relatively small and widely separated, and public transit is pretty limited.