United States
Exit Glacier retreating in real time; the trail markers show where it stood each decade.
The year markers tell the story before you reach the ice. Each sign stands where Exit Glacier's face once towered, and the gaps between them widen decade by decade. At the terminus the glacier groans, a low percussive sound that travels through the gravel under your boots.
Kenai Fjords is where glacial retreat becomes something you walk through: Exit Glacier has pulled back more than a mile since the early 1800s, and the park has posted year-labelled markers along the approach so the timeline is under your feet. Above it spreads the Harding Icefield, seven hundred square miles of ice and the largest icefield entirely within the United States, feeding nearly forty glaciers down every side. Boat tours out of Seward run beneath the tidewater faces, and the cold fjord water carries orcas, humpbacks, sea otters, Steller sea lions and rafts of puffins; sightings are frequent, never guaranteed, which is what makes them sightings. Seward itself, the little harbour town at the head of Resurrection Bay, is joined to Anchorage by one of the great coastal rail journeys.
Couple
Take the coastal train down, board a fjord boat for the glacier faces and let the whales decide whether to make the anniversary.
Friends
Kayak beneath the tidewater ice or grind up the Harding Icefield Trail, then split dockside halibut in Seward while the derby boats weigh in.
Family
The year markers on the glacier trail turn climate science into a walk children genuinely understand, and puffins do the rest.
Halibut and chips at a Seward dockside window between boat tours, fried while the boats unload more.
Silver salmon in derby season, when one of Alaska's oldest fishing contests fills Resurrection Bay with hopeful boats.

Augrabies Falls National Park
South Africa
Aukoerebis takes its name from the roar as the Orange River plunges fifty-six metres.

Ang Thong Marine Park
Thailand
Forty-two jungle islands hiding an emerald saltwater lake inside a collapsed limestone crater.

K'gari (Fraser Island)
Australia
Freshwater lakes glow blue above the sea on the world's largest sand island.

Dune du Pilat
France
Europe's tallest sand dune — a hundred metres of hot grain, the Atlantic crashing below.

Yosemite Valley
United States
Climbers shrink to moving specks on a granite face three thousand feet above the meadow.

Columbia River Gorge
United States
A flood-torn canyon whose green basalt walls stream with waterfalls, one of them 620 feet.

Watkins Glen
United States
Nineteen waterfalls crash through a chasm as stone steps thread over, under and through the spray.

Hawai'i Volcanoes
United States
Ground younger than you are, built by two of Earth's most active volcanoes.