Yellowstone National Park, the world's first national park and a UNESCO World Heritage site, is enormous.
But the 2.2 million-acre Yellowstone doesn't even come close to the nation's largest national park, the remote Wrangell-St. Elias National Park & Preserve in Alaska.
It would take six Yellowstones to fill Wrangell-St. Elias' 13.2 million acres.
Wrangell-St. Elias is also home to the nation's largest glacial system, nine of the 16 highest US peaks, North America's largest piedmont glacier and longest tidewater glacier and the world's longest interior valley glacier.
More than 25% of Wrangell-St. Elias is covered by glaciers, which could explain why this park 200 miles east of Anchorage hosted just 80,000 visitors in 2015.
The best window to visit is closing soon. Snow often arrives in the park by late September, and the two state roads into the park are not regularly maintained during winter.
