The Ambigram Magazine 'Where in the World' Challenge

Ambigram Magazine has announced their latest ambigram design challenge:  Where in the World.  The idea for this challenge is to design ambigrams for the names of major world cities.  With that in mind, here are some quick doodles I sketched this morning for the cities of Chicago, Los Angeles, and Amsterdam.  They are obviously rough, but should show each concept as a 'work in progress'.