The Grand Canyon is a massive gorge in Arizona carved by the Colorado River over millions of years. It stretches 277 miles long, up to 18 miles wide, and plunges more than a mile deep in places. Standing at its rim feels like looking at a vast city made entirely of layered rock, with colors ranging from deep reds and oranges to pale yellows and grays.

The canyon's walls tell Earth's story like pages in a book. Each layer represents a different period in history, with some rocks at the bottom dating back nearly two billion years. Scientists study these layers to understand ancient oceans, deserts, and climates that existed long before dinosaurs walked the Earth.

Native American tribes, including the Havasupai and Hopi, have lived in and around the canyon for centuries, considering it sacred. Today, millions of visitors from around the world come to see it each year. Some hike down the steep trails to the river below, which can take a full day. Others raft through the canyon's rapids or simply stand at the rim, amazed by the sheer scale of what water and time can create.

The Grand Canyon became a national park in 1919, protecting this natural wonder for future generations. Its size and beauty make it one of the most recognizable landmarks in the United States.