The Grand Canyon

grand_canyon_6, a photo by Learning-by-Action on Flickr.

What could be more timeless than the Grand Canyon? The rocks exposed over time range from 200 million to nearly 2 billion years old. 2 billion years old...let that figure wash over you a moment. Neither the deepest nor the longest canyon in the world, the Grand Canyon is nevertheless world renowned, and justly so, for its jawdropping beauty and scope. 5 million visitors a year can't be wrong. Stand on the rim, and gaze. Awe-some.