Dallas Pedestrian Network

The Dallas Pedestrian Network or Dallas Pedway is a system of grade-separated walkways covering thirty-six city blocks of Downtown Dallas, Texas, United States. The system connects buildings, garages and parks through tunnels and above-ground skybridges. The network contained an underground city of shops, restaurants and offices during weekday business hours, but has been largely abandoned, and is no longer continuous. The underground network was the idea of Montreal urban planner Vincent Ponte, who was also responsible for Montreal's Underground City.

Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).