Also known as Tahoma, or Tacoma, Mount Rainier is a unique U.S. mountain climbing landmark. At 4,392 m, it is the highest mountain in the country and is also home to one of its largest glaciers. The three main routes to the top of this stratovolcano are all technically challenging. The normal route is a YDS grade II-III; the Emmons Glacier Route is a grade II and is slightly easier; the most difficult grade IV route is the Liberty Ridge route. It goes without saying that taking proper precautions and going with a certified guide is a must to tackle this stunning U.S. giant.