Mount Rainier, standing at 14,406 feet, is the tallest mountain in the state of Washington and is the most topographically prominent peak in the contiguous United States. The sleeping giant of the Cascade Volcanic Range, also known as Tahoma, can be seen from lower elevations of both Clark and Cowlitz counties from the right spot. In Clark County, the peak of Mount Rainier can be visible on the bottom left of Mount St. Helens from areas like Bar…