For those of you staying in Frankfurt for a night or some hours here's a free tour book that covers just the main sights of the downtown/old town area. Please note that the trains from the airport (S8 and S9) stop directly at sight #18, Hauptwache, which makes for a great hub for you.http://www.frankfurt.de/sixcms/media.php/738/frankfurt_en_citytour_s.pdf
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