Rocky Mountain National Park

Grab your oxygen tanks and ascend high into the Colorado Rocky Mountains. At nearly 13,000 feet above sea level, you'll explore one of the only places you'll find true tundra in the Lower 48. Battered by hurricane-force winds and bitterly cold temperatures for 9 months of the year, it truly takes the hardiest of species to survive in such an extreme environment. But make sure not to rush. With only 60% of the oxygen available at sea level, it can be a struggle just to breathe at those high altitudes.