Until the Times covered it today, I had no idea downtown Houston’s tunnel system was thriving with so many businesses or so extensive. It’s also almost entirely private:
It was not centrally planned; it just grew, inspired by Rockefeller Center in New York. But it is not connected to a transit network. And, befitting Texans’ distrust of government, most of it is private; each segment is controlled by the individual building owner who deigns to allow the public access during business hours — and then locks the doors on nights and weekends. Some parts, like those belonging to the former Enron buildings now leased by Chevron, are closed to outsiders altogether.