The mystery of the Great UnconformityIn 1869, a man named John Wesley Powell observed that several layers of rock that should've been in the Canyon walls were not present. More than a billion years of rock are missing from the walls.
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It's estimated that there are more than 1,000 caves inside the Grand Canyon, with only 335 documented and even fewer mapped, explored, or inventoried. Today only one cave is open for visitors to explore, and it's called- the Cave of the Domes on Horseshoe Mesa.
Havasupai FallsOne of the best-kept secrets of the Grand Canyon comes in the form of a gushing waterfall. Havasupai Falls has remained well-hidden thanks to the 10-mile hike it takes to reach its crystal blue waters.
?? The discovery of Egyptian hieroglyphics and artifacts in the Grand Canyon suggests that upwards of 50,000 Egyptians may have inhabited the area, challenging traditional historical narratives.
Nestled along the Idaho and Oregon border lies one of the greatest natural wonders in North America: Hells Canyon. Carved by the Snake River, the gorge is ten miles wide and plunges 7,913 feet. That's 2,000 feet deeper than the Grand Canyon – making it the deepest river gorge in North America.
The Havasupai people (Havasupai: Havsuw' Baaja) are an American Indian tribe who have lived in the Grand Canyon for at least the past 800 years. Havasu means blue-green water and pai people.
At least 56 people have been reported missing from Grand Canyon National Park since the beginning of 2018 and at least six people have been found dead. This is despite the park not only being smaller but seeing millions fewer visitors than many of the other 424 national park sites.
There are hundreds of unexplored cavesWhile this National Park is known for its canyons, there are actually over 1,000 caves within the park's territory. However, only 335 have been documented, and only the Cave of the Domes is open to visitors to explore.
The Great Unconformity exposed in Grand Canyon separates the Tapeats Sandstone from ancient Proterozoic rocks. The Great Unconformity represents ~1.2 billion years of missing rock record, either due to erosion or non-deposition.