Photo Credits
- Incheon City: Flickr/traveloriented, License: CC BY-SA 2.0
- Rennes City: Flickr/nicolas_vollmer_photo, License:CC BY 2.0
- Dijon City: Flickr/aschaf, License:CC BY 2.0
- Ostrava City: Petr Šmerkl, Wikipedia, License: CC BY-SA 2.0
- Harbin City: Flickr/derekharkness, License:CC BY 2.0
- Brandenburg Gate: Flickr/fredrikenestad, License:CC BY 2.0
