Where Hubbard Glacier meets the sea, its 6-mile-wide face calves huge blocks of ice.
The Everglades are a 60-mile-wide, super-slow-moving subtropical river covering the tip of Florida.
A mile down from the canyon’s rim, the Colorado River is still cutting.
The tallest trees on the planet hide out in a few remaining tracts of Northern California’s old-growth coastal forests.
The tourist vessel “Maid of the Mist IV” does a float-by of the American Falls.