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Grand Canyon 大峡谷
Though the theory is still up for debate, experts think this colossal canyon was formed 17 million years ago, when the Colorado River carved through the gorge, eroding the rock. A breathtaking 277 river-miles long, 18 miles wide and a mile deep, the famous landmark drew just under 4.5 million visitors in 2009. Photo by Shutterstock.
尽管理论尚处于争论之中，但专家们认为这条巨大的峡谷是一千七百万年前，科罗拉多河流横穿峡谷腐蚀岩石而形成的。有着令人惊叹的277英里的河长、18英里的宽度和1英里的深度，这处著名的景观2009年吸引了接近450万人次的游客。由 Shutterstock拍摄。
