Mount Rainier in Washington State, elevation 14,500 ft.
Take a look at some of these incredible clouds captured over Mt. Rainier. They're called "lenticular clouds". They're caused when the air flow is just right so that when it flows over Mt. Rainier, the air gets pushed upward where it cools and condenses into clouds. Talk about homesick inducing. These pictures are just about enough to send me packing.