I have this new favorite app called Camera+. It does this:
These photos were taken on my first Colorado hike in the Chautauqua Trails in Boulder. I never knew why everyone said the air was thin here in Colorado because I've lived here my whole life. But after living at sea level for about 3 years, I finally understand. I couldn't make it to the top of the trail because I was so out of breath.
(This one was in Lakeside, CA)
There is one downside to downloading this app though... I keep getting disappointed by real life because it's not as beautiful as it is in my photos.