United States
Earth exhaling through turquoise pools while bison block the only road ahead.
Yellowstone smells like the inside of the planet: sulphur off the vents, mineral steam drifting across the boardwalks, the wet-metal tang of springs that have boiled since before recorded history. Bison block the road with no urgency at all, and the ground under your feet is visibly unfinished.
Yellowstone sits on a volcanic hotspot that powers some ten thousand hydrothermal features, from mud pots to the great geysers, more than anywhere else on Earth. Grand Prismatic Spring spreads wider than a football field, its rings of colour painted by heat-loving microorganisms that shift hue with the seasons. Old Faithful still performs, each eruption predicted by rangers to within a window of minutes, but the rawest theatre is the Lamar Valley at dawn, one of the most reliable places in the world to watch wild wolves hunt. The park sprawls across three states over an area bigger than Rhode Island and Delaware combined, and it started everything: on 1 March 1872 it became the first national park in the world.
Family
Old Faithful gives children a spectacle with a published time, the boardwalks turn geology into theatre and bison jams beat any safari film.
Couple
Take the Lamar Valley at first light for wolves, then spend the evening on a lodge porch while the geyser basins steam against the sunset.
Friends
Split dawns between wolf-watching pullouts and geyser basins, then argue over whose photograph of Grand Prismatic least fails the real thing.
Huckleberry ice cream at the park fountains, made with the high-country berry that has never been farmed.
Lake trout from Yellowstone Lake, the invader the park requires anglers to keep, panfried at the campground.

Öland
Sweden
A windmill-studded limestone steppe reached across six unbending kilometres of bridge.

Khao Yai National Park
Thailand
Wild elephants block the tarmac road while hornbills beat the air above the canopy.

Peneda-Gerês
Portugal
Portugal's only national park — granite canyons, wild horses, Roman milestones on lost paths.

Sundarbans
India
Mangrove swamps where tigers swim across muddy delta rivers and honey-gatherers wear masks facing backwards.

Mount Rainier
United States
A volcanic cone draped in more glaciers than any peak in the contiguous United States.

Sleeping Bear Dunes
United States
Sand bluffs four hundred and fifty feet tall plunging into Lake Michigan's turquoise shallows.

Acadia National Park
United States
Winter's first American sunrise strikes Cadillac's pink granite before the country below wakes.

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