Secret tunnels under Dallas, includes map and entrance points. Interdasting. https://www.narcity.com/things-to-do/us/tx/dallas/dallas-secret-tunnels-dallas-pedestrian-network  There's a system of underground tunnels in Dallas called the Dallas Pedestrian Network, it was a project spearheaded by an international city planner, Vincent Ponte, in the late 1960s.  The tunnels, as they're known by locals, connect over 36 city blocks and extend to over two miles underneath the heart of Dallas. These half-mysterious, half-creepy tunnels connect major landmarks such as the Winspear Opera House, Dallas Holocaust Museum, Kay Bailey Hutchison Convention Center, Dallas World Aquarium, and the Dallas Farmers Market. The entrances are hidden in plain sight. Some aren’t even marked so you kind of have to know what you’re looking for! The major entrances are located at Thanks-Giving Square, Renaissance Tower, One Main Place and Bank of America Plaza.