Panoramio allowed users to upload photos, tag their geo-location, and share them with other community members. It was created in 2005 by two Spanish entrepreneurs - Joaquín Abela and Eduardo Aguilar. Google acquired it in 2007.
Initially, Google used Panoramio for augmenting the Google Maps and Google Earth services with the content users uploaded. This way, people could see various places as viewed by those taking the pictures.
Since Google launched their Local Guides program and added an option to upload pictures to Maps, Panoramio became more or less redundant, and Google tried to shut it down in 2014. Loyal users started a petition and convinced the tech giant to reconsider. The second cancellation turned out to be final, though, and Google stopped supporting the app after November 4, 2016.
Google automatically copied all images from Panoramio to Google+ for users who had both services and had linked them beforehand. The rest could still access their content till November 2017.