The multilevel streets in downtown Chicago. Thanks a lot to <a href="https://en.wikipedia.org/wiki/User:Knowledge_Seeker" class="extiw" title="en:User:Knowledge Seeker">Knowledge Seeker</a> and <a rel="nofollow" class="external text" href="http://www.chicagocarto.com/">Dennis McClendon</a> for help.
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<a href="//commons.wikimedia.org/w/index.php?title=User:SPUI&amp;action=edit&amp;redlink=1" class="new" title="User:SPUI (page does not exist)">SPUI</a></div>
<span class="int-own-work" lang="en">Own work</span>