We love when architects and urban planners dream big and come up with absurd visions for future cities. Not every idea works out, though.
What crazy vision of a future seemed like such a good idea at the time, but in retrospect is really terrible? These ideas don't have to have been made, and they should be stranger than these real-life bizarre urban ecosystems. The more trippy the design (like Normal Bel Geddes' 1939 automated, inhuman Futurama), the better.