Those intrepid Googlers have been taking their cameras on more adventures: now you can take a run down the Colorado River Rapids on Street View.
Only mapped in 1869 and now America's most endangered river, the Colorado has flowed through the western desert for six million years—in turn, forming the Grand Canyon. As well as running the rapids, you can saunter through sleepy river beds and explore rarely seen side canyons. Go explore! [Google]