"Rainbow over Niagara Falls" by Bryan Groff is licensed under CC BY 4.0
"Skyfire over San Francisco Bay Bridge" by Clint Sharp is licensed under CC BY-NC-SA 4.0
"The Speicherstadt in Hamburg, Germany" by Claudio Testa is licensed under CC BY 4.0
"View from The Hague, Netherlands" by Gerrit Vermeulen is licensed under CC BY 4.0
"Night lights in Sao Francisco, Portugal" by Paulo Valdivieso is licensed under CC BY-SA 4.0
"How is seen New York from Rockefeller Center" by Matthew Kane is licensed under CC BY 4.0