Several images on the website are used under a Creative Commons license. These are:
SeattleI5Skyline by Cacophony, used under Creative Commons Attribution-Share Alike 3.0 Unported license.
Linear City-Scape from Gweb, used under Creative Commons Attribution 3.0 license.
Santiago de Chile de noche by Javmoraga, used under Creative Commons Attribution-Share Alike 3.0 Unported license.
Bike and scooter share from Anthony Quintano, used under Creative Commons 2.0