A-frames might not be as beautiful or functional as traditional cabins but they can help you find your dream cabin. They are often located in areas of forested and mountainous terrain including Colorado, Utah, and the Pacific Northwest. A-frame cabins look like an equilateral triangle or capitalized version of the letter that is the first in the alphabet. These A-frames are found in forested, mountainous areas such as Colorado, Utah, or the Pacific Northwest. A-frames can be built in many different places including near lakes or hiking areas.