48617-48623 Herman Leirer Road
Exit GlacierOne of Alaska’s most accessible glaciers, this behemoth spills from the 1,813-square-kilometer (700-square-mile) Harding Icefield. Reach its edge via a moderately strenuous, 3.9-kilometer (2.4-mile) roundtrip hike or just catch a glimpse from the spotting scope at the ½-mile mark (wheelchair accessible). For decades, Exit Glacier was losing an average of 13 meters (43 feet) per year, but its melting rate has nearly tripled since 2008. This has made the spectacular landscape a poster child for climate change, especially after President Barack Obama trekked there to raise awareness.