Among the many canyons around the U.S., like this underrated Montana canyon in the Rockies or this Texas canyon that is less crowded than the Grand Canyon ... world's longest art gallery ...

"After a day at Norris we left for the Grand Canyon where we stayed two days and made a great ... as ever and I was completely carried away by its magnificence. I think I can paint a better picture of ...

On the count of three, look up,” says our guide when we stop shuffling our feet, not looking up just yet and nearing the edge ...