IT’S NOT THE WORLD’S DEEPEST CANYON
Let’s clear up this misconception right off the bat. The Arizona landmark may well be the world’s grandest canyon, but it’s not the deepest. Agreeing on how to measure the depth of gorges is a surprisingly difficult task, but depending on who you ask, that distinction goes to Peru’s Cotahuasi Canyon, which is over 11,000 feet deep, or Nepal’s Kali Gandaki Gorge. The Grand Canyon, on the other hand, is just one mile deep.
THE CANYON WAS HOME TO AN EARLY “INSTANT PHOTO” BUSINESS
Brothers Emery and Ellsworth Cobb devoted their lives to photographing natural beauty, and in setting up a studio on the South Rim of the canyon in 1906, they found a savvy business opportunity as well. From their studio at the head of the Bright Angel Trail, the brothers would snap photographs of tourists as they departed for the canyon’s bottom on mules. When the tourists made their way back up to the rim that evening, the brothers would be ready to sell them developed prints documenting their journey.
IT WAS THE SITE OF A GRAND HOAX
On April 5, 1909, the Arizona Gazette detailed the findings of two archaeologists who claimed to have discovered traces of either an ancient Tibetan or Ancient Egyptian civilization in an underground tunnel network within the Grand Canyon. The story of ancient artifacts like copper and gold urns and mummified bodies discovered by two affiliates of the Smithsonian caused quite a stir, but it unraveled quickly. The Smithsonian denied any knowledge of the pair of scientists, and subsequent searches failed to uncover the “nearly inaccessible” cavern the (possibly fictitious) duo claimed to have found. Despite this lack of evidence, the belief that the Smithsonian actually found and covered up this cave of wonder remains persistent among conspiracy theorists.
THE FIRST EUROPEANS SAW THE CANYON IN 1540
After thousands of years of inhabitation by Native American groups, the Grand Canyon welcomed its first European visitor in the 16th century. Aided by Hopi locals, Spanish conquistador García López de Cárdenas led an exploration of the grounds in 1540, even sending three soldiers to explore the canyon’s depths. The trek didn’t last very long: The soldiers were overcome by thirst, possibly because the Hopi intentionally safeguarded their valued Colorado River from the travelers’ reach. 
TEMPERATURES DIFFER GREATLY FROM THE TOP TO THE BOTTOM OF THE CANYON
A trek from the peak of the Grand Canyon’s North Rim, which stands about 8000 feet above sea level, to its bottom a mile down may see a traveler experience temperature swings of more than 25º Fahrenheit. Summer highs in the depths of the gorge can exceed 100ºF, and winter lows at the crest can dip to 0ºF.
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