Rocky Mountains GuideThe Rocky Mountains are a western region of the United States of America, and offer skiing and snowboarding in the winter, and road and mountain biking, hiking, camping, kayaking, horse-back riding, and white water rafting in the summer. HotelsFind hotels in Denver, Yellowstone National Park, West Glacier, Grand Junction and more. DenverDenver is the capital and largest city of Colorado, USA. Known as "The Mile-High City", Denver sits at an altitude of 5,280 feet/1,600 meters above sea level and lies where the Great Plains give way to the Rocky Mountains. Yellowstone National ParkYellowstone National Park is a United States National Park and a UNESCO World Heritage Site. ColoradoColorado is a western state in the Rocky Mountains region of the United States of America. MontanaMontana is a state in the northern/northwestern United States, in the Rocky Mountains region. WyomingWyoming is a state in the Rocky Mountain region of the United States of America. Wyoming's geography includes wide-open plains, swaths of high desert and sweeping mountain ranges. IdahoIdaho is state in the Rocky Mountains region of the United States. Idaho is a rugged state, with 10,000 - 12,500 ft snow-capped mountains, whitewater rivers, forests, high desert, and plenty of wilderness.