An account from a contracted explorer for the Smithsonian Institute in 1909 tells a fascinating tale of what he supposedly found in a cave deep within the Grand Canyon, high on the steep cliffsides of the Colorado River:
G.E. Kincaid wrote:
So not only did this man claim to find Egyptian artifacts, hieroglyphs, and mummies, but he also notes there were Vedic artifacts, such as a Buddha-like statue and lotus symbolism.
I wanted to know where this purported cave would be located were it to exist, so I went on a little hunt. Judging by certain accounts of mile markers, directions of currents, and descriptions of landscape, I think I've honed in on the general area, within 5 miles at least of where this mythical cave opening could be found. Of course, it's almost impossible to get to, and exists in an area of the Grand Canyon where no visitors are allowed--not even park officials. It might lie within Navajo territory, or closely border it.
Head over to Google Maps and search for "Nankoweap Granaries" (North Rim, Arizona). Scroll down (southward) along the Colorado River there until you see the LCR Confluence Overlook on the right of the river.
Just north of that overlook, you'll notice that an artificial looking line seems to have been overlain on the aerial image:
The line just so happens to fall right around the area I estimate Kincaid's Cave is located, to the right, or eastern, side of the Colorado River there.