Cincinnati's Abandoned Subway

https://en.wikipedia.org/wiki/Cincinnati_Subway#The_idea

http://cdn.urbancincy.com/wp-content/uploads/2014/01/Cincinnati-Subway-System.jpg-
http://www.urbancincy.com/2014/02/infographic-the-abandonment-of-cincinnatis-1914-subway-and-rapid-transit-loop

http://www.forgottenoh.com/subway.html

http://www.gleems.com/861711/unbelievable-pictures-of-cincinnatis-abandoned-ghost-subway-system/4

https://www.google.ca/search?q=Cincinnati%E2%80%99s+Abandoned+Subway+System

http://jalopnik.com/the-ten-most-ambitious-subway-systems-ever-devised-1484113202