This virtual reality/augmented reality app looks quite amazing. It's in beta now if I'm not mistaken and ONLY for Android devices. Supposedly it may come to iOS. Hope that happens soon!
https://www.youtube.com/watch?v=92rYjlxqypM
www.ingress.com
https://www.youtube.com/watch?v=92rYjlxqypM
www.ingress.com