Despite being one of the most visited places in the United States, the Grand Canyon area in Arizona, still holds secrets. One of these is the Indian village of Supai located at the bottom of Havasu Canyon also known as Cataract Canyon, a side branch of the Grand Canyon, on the Havasupai Nation reservation. Home to the Havasupai tribe who have been living in the Grand Canyon for at least the past 800 years, Supai is perhaps the most isolated village in the United States. Although its just 13 km from the nearest road, no cars can reach it. The only way to get to it is to take a helicopter or to hike or ride a mule along the Havasupai Trail. Supai is the only place in the United States where mail is still carried out by mules.

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