Ice cave and stream in Oregon's Three Sisters Wilderness, USA (@ Marc Adamus/Getty Images)

Ice cave and stream in Oregon's Three Sisters Wilderness, USA (@ Marc Adamus/Getty Images)

comments,

• These strange caves are said to be nearly impossible to find.""The trail is always going cold
• According to local folklore, this was a nearby town\s ice source in the days before electricity.""How would you feel about popping down here to get some?
• Hidden away underground in a wilderness area spanning 1,160 square kilometres is this.""Has anyone actually ever found a needle in a haystack?
• The beauty of this US state isn\t only seen by exploring deep beneath the Earth\s surface.""Quite the opposite, in fact