Tulsa skyscrapers have been connected by underground tunnels which have created a net. They were used during prohibition to smuggle alcohol.
Urbane Chaos website http://urbane-chaos.hubpages.com/hub/Downtown-Tulsa-Underground-Tunnels
Address 511 S Boston Ave Tulsa, OK 74103, USA
Coordinates 36°9'5.63" N -95°59'18.575" E
