Mount Spurr, located about 75 miles West of Anchorage, has been acting up in recent weeks, prompting officials at the U.S. Geological Survey and Alaska Volcano Observatory to issue a yellow alert.

Another nearby volcano that erupted in 2009, Mount Readout, showed volcanic tremor for two months before it blew its top. "If we see [tremor]," Haney said, "that will be the next sign that Spurr ...

Mount Aspiring National Park is a wonderful mixture of remote wilderness, high mountains and beautiful river valleys. It is a walker's paradise and a must for mountaineers.

Aoraki/Mount Cook National Park is a rugged land of ice and rock, with 19 peaks over 3,000 metres including New Zealand's highest mountain, Aoraki/Mount Cook.