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Image credits: (CC = Creative Commons, PD = Public Domain) Tour !: www.flickr.com/photos/dalbera/5911810278/ (CC); Tour II: www.flickr.com/photos/rmlowe/4433386689/(CC); Tour III: www.flickr.com/photos/sebastian_bergmann/1440512689/ (CC); Tour IV: Colosseo, ca. 1858 by Tommaso Cuccioni en.wikipedia.org/wiki/File:Tommaso_Cuccioni_Colosseo_1858.jpg (PD); Tour V: commons.wikimedia.org/wiki/File:Hadrian_Santa_Bibiana_Massimo.jpg (PD); Tour VI: www.flickr.com/photos/fresus/973376027/ (CC); Tour VII: www.flickr.com/photos/versae/2756568782/ (CC); Tour VIII: www.flickr.com/photos/evilmoz/4263555850/ (CC); Tour IX: Marten253 commons.wikimedia.org/wiki/File:Porta_Maggiore_Roma.JPG (CC); Tour X: Int3gr4te en.wikipedia.org/wiki/File:ApolloAndDaphne.JPG (CC); Tour XI: www.flickr.com/photos/72213316@N00/2391066515/ (CC); Tour XII: commons.wikimedia.org/wiki/File:Celio_-_via_Appia_dalla_torre_della_porta_san_Sebastiano_1996.JPG (PD)