There may be larger canyons around the world, but ours is very grand. The kids & I recently went to the less-travelled North Rim, which is higher in elevation.
We also saw Roosevelt Point on the North Rim:
Here's a picture from October, 2010, when I took them to the South Rim:
(Both times, my husband had either work or study obligations. But he & I went to the South Rim a few years ago for our wedding anniversary.)