Grand Canyon

The canyon walls offer a literal window back in time. The oldest rocks exposed at the very bottom of the gorge are nearly two billion years old, representing nearly half of the entire lifespan of planet Earth.

Despite the ancient age of the rocks themselves, the canyon is a surprisingly recent addition to the landscape. Geologists estimate that the river only began carving out the current shape of the gorge around five to six million years ago.

The Colorado River carved the stone using the physics of liquid sandpaper. The water constantly carries millions of tons of heavy rocks, silt, and abrasive sediment, which continuously grind against the riverbed and deepen the massive gorge every single day.

The sheer depth creates extreme and completely unpredictable temperature differences. Because the canyon floor is a mile deep, it can be freezing and snowing up on the rim while hikers are simultaneously sweating in hundred-degree desert heat at the very bottom.

The vast size of the canyon means it creates its own weather. It is so massive that it harbors entirely distinct microclimates, allowing environments to range from dry, scorching deserts at the base to lush, high-altitude boreal forests at the North Rim.

You will never find a single dinosaur fossil hidden in the canyon walls. The visible rock layers were either formed billions of years before dinosaurs ever existed, or they were completely eroded away long before the giant reptiles walked the earth.

A modern engineering marvel allows you to walk straight out into the sky. The Grand Canyon Skywalk is a horseshoe-shaped glass viewing platform that extends seventy feet over the edge, engineered to be so incredibly strong that it could theoretically hold the weight of seventy fully loaded passenger jets.

It serves as an absolutely massive evolutionary barrier for local wildlife. Two different species of squirrels live on opposite rims, having evolved entirely separate physical characteristics because the giant chasm prevented them from ever crossing over to mix.

The area is home to a completely unique, highly specialized snake. The Grand Canyon pink rattlesnake is an endemic species that evolved to perfectly match the dusty, reddish colors of the surrounding rocks, making it practically invisible to its prey.

It is significantly larger than the entire state of Rhode Island. The winding gorge stretches for an unbelievable two hundred and seventy-seven miles long and can reach up to eighteen miles across at its absolute widest point.

The canyon is filled with a vast, hidden underground network. There are an estimated one thousand intricate caves hidden deep within the limestone walls, but only one single cavern, known as the Cave of the Domes, is officially open to the public for exploration.

The US Postal Service still relies on pack animals here. The remote village of Supai, located deep at the bottom of the canyon on the Havasupai Indian Reservation, is one of the only places in the country that still gets its daily mail delivered by a dedicated team of mules.

Astronauts can easily admire the view from outer space. The winding, jagged scar of the canyon is so incredibly vast that it is regularly photographed by astronauts aboard the International Space Station without the need for any specialized visual aids.

Early entrepreneurs tried and failed to mine the area for profit. Before it became a heavily protected national park, prospectors attempted to establish lucrative copper, asbestos, and lead mines, but the extreme terrain made it nearly impossible to transport the materials out.

Humans have been exploring and living in the region for over ten thousand years. Ancient indigenous cultures left behind thousands of fascinating artifacts, including small split-twig animal figurines hidden in caves and beautiful petroglyphs carved directly into the ancient stone walls.