Grand Canyon of USA

We have to root a little for the home team. And here in the United States, the astonishing depths and incredible sunsets of the Grand Canyon make it a shoe-in on this list. Plus you can enjoy the scenery while you work up a sweat, hiking the rigorous Bright Angel Trail or rafting the Colorado River. As President Theodore Roosevelt famously noted, this park is "one of the great sights which every American, if he can travel at all, must see." Many take Teddy up on his word -- so if you want to explore this northern Arizona park, we suggest you avoid the staggering crowds of the summer. Consider visiting between March and May or September and November, when the weather is pleasant and the lodging rates are reasonable.