The Paradise Ice Caves (also known as the Paradise Glacier Caves) were a system of interconnected glacier caves located within Mount Rainier's Paradise Glacier in the United States. These glacier caves were visited and documented at least as early as 1908.^[1] They have a varied natural history, as their size and even existence has changed over time, from a maximum surveyed length of 13.25 kilometers in 1978, to not existing at all during both the 1940s and 1990s^[2] due to glacial recession. In 1978 they were the longest mapped system of glacier caves in the world.^[3]