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“Istanbul” by szeke is licensed with CC BY-SA 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/2.0/
“Belfast City Hall – May 2012” by infomatique is licensed under CC BY-SA 2.0
“Leeds City Centre” by The Jaco is licensed under CC BY 2.0
“Bilbao city skyline from Etxebarria Park” by mattk1979 is licensed under CC BY-SA 2.0
Chattanooga skyline by James Pressley – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=36062813
San Jose by Adam Schultz – Flickr: IMG_0934, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=69822827
Cordoba by Cholka Pablo Gautero / CC BY-SA (https://creativecommons.org/licenses/by-sa/2.0)
Buenos Aires by Tigre Municipio / CC BY (https://creativecommons.org/licenses/by/2.0)
“Brasilia” by Inmigrante a media jornada is licensed under CC BY-NC-SA 2.0
Mexico City by Alejandro Islas Photograph AC / CC BY (https://creativecommons.org/licenses/by/2.0)
“7.-newcastle-australia-photo-provided-by-newcastle-copy copy” by tironasarah is licensed under CC BY-NC 2.0
Melbourne by Donaldytong – Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=3934239
Medellin by JoranL – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=93314637
Manila by Patrickroque01 at English Wikipedia
Barcelona by GeoTravellers
Lisbon – Public Domain Certification
Bogota – Jeisson Daniel Rondon www.dalcubo.com
Dubai – Phil6007
Bangalore – Amol.Gaitonde. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
Hyderabad – Yedla70. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
Indore – Kprateek88. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License
Faridabad – RISHABHNAGPAL20
Moscow – https://commons.wikimedia.org/wiki/File:Moscow_International_Business_Center20.jpg
Dallas – Photo by R K on Unsplash
Muscat – Photo by Anfal Shamsudeen on Unsplash
Pittsburgh – Photo by Lance Anderson on Unsplash
Tampere – Photo by Jyrki Nieminen on Unsplash
Toronto – https://en.wikipedia.org/wiki/File:Toronto_ON_Toronto_Skyline2_modified.jpg