Paid iPad app: http://itunes.apple.com/mg/app/geopop/id489992345?mt=8&uo=4&at=10l6SU
Website: https://www.google.com/culturalinstitute/
Free iPad app: https://itunes.apple.com/us/app/id1050970557?mt=8&at=10l6SU
Free iPhone app: https://itunes.apple.com/us/app/id1050970557?mt=8&at=10l6SU
Free Android Phone app: https://play.google.com/store/apps/details?id=com.google.android.apps.cultural
Free Android Tablet app: https://play.google.com/store/apps/details?id=com.google.android.apps.cultural
Website: http://geoguessr.com/