2) Mendenhall Ice Caves, Alaska
Experience water in its every form in the Mendenhall Ice Caves in Juneau, Alaska. The 12-mile long glacier cave is only accessible via kayak, followed by a climb up and over the glacier. Clearly, even the entrance to this natural wonder is no easy achievement. You will then descend into the glacier, which is where the otherworldly experience begins. The caves are located inside the glacier. Ice forms the canopy of the cave, with rushing water flowing through the hollow parts. Simply an incredible feat of nature. The ice caves are located 12 miles from downtown Juneau, and are federally protected within the Tongass National Park. Unfortunately, this gentle giant is not immune to the threat of global warming; the glacier has been monitored since 1942 and scientist have found it has retreated two miles since 1958.
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