From the CityLab Design Edition newsletter:
The Dallas Pedestrian Network is a complex of underground tunnels and concourses that stretches beneath downtown. The tunnels connect to the basements of office towers across some 36 city blocks. Built during the period of urban renewal in the 1960s, when population growth in Dallas and many other cities began to stall, the pedway promised a new model for commuting, shopping and living.
Many of the Dallas tunnels are still open today — despite the fact that almost no one uses them. A handful of eateries still operate in the food courts below some of the towers, but many properties have them sealed off. Retail bays for shops can be found throughout the tunnels, but virtually all of them are closed. Many of the stores are abandoned, jumbled with chairs, desks and other signs of former use. Creepier still, the tunnels are all spotless.