United States
Brown bears shoulder-deep in the rapids, snatching leaping salmon straight out of the air.
The roar reaches you before the sight does: white water churning through a rocky chute while brown bears stand chest-deep in the Brooks River, jaws open, waiting. Sockeye launch upstream in silver arcs and the bears take them mid-flight with a precision that makes the violence look choreographed.
Katmai is reached only by floatplane or bush plane; no road touches it. Each year 200,000 to 400,000 sockeye salmon jump Brooks Falls, and in the July and September runs the river draws dozens of brown bears, with around fifty living along the Brooks corridor at the peak; the viewing platforms stand directly over the action. The park dates from 1918, created to protect the country devastated by Novarupta, one of the most powerful eruptions in recorded history, whose forty-square-mile ash sheet is still called the Valley of Ten Thousand Smokes. Come October, the park's Fat Bear Week has the internet voting on which pre-hibernation giant, the heaviest approaching 1,400 pounds, wore the summer best.
Solo
The floatplane in, the platform hours watching bears work the falls and the total absence of signal reset a person faster than any retreat.
Friends
Sharing a camp or lodge while bears fish a few hundred metres away builds the kind of story a group retells for decades.
Meals at Brooks Lodge, the 1950 bush fishing camp turned bear-country base minutes on foot from the falls.
Sockeye on the grill, the same run the bears are fishing a few hundred metres upstream.

Corryvreckan
Scotland
One of Earth's largest whirlpools churns between two islands, its roar carrying across open sea.

Central Island
Kenya
Three volcanic crater lakes in three different colours on an island ruled by Nile crocodiles.

Mingulay
Scotland
An evacuated island where seabirds inherit the village and 215-metre cliffs guard the Atlantic edge.

Morotai
Indonesia
Wartime aircraft rest on Morotai's reefs, coral colonising the cockpits.

Canyonlands
United States
The Colorado and Green Rivers fracture the Earth into a labyrinth of mesas with no bottom.

Grand Staircase-Escalante
United States
Slot canyons so narrow you turn sideways to pass through walls of swirled sandstone.

Big Bend
United States
Santa Elena Canyon walls rising fifteen hundred feet on either side of the Rio Grande.

North Cascades
United States
More glaciers than any park in the lower forty-eight, yet almost no one comes.