United States
Earth exhaling through turquoise pools while bison block the only road ahead.
Yellowstone smells like the inside of the Earth β sulphur rising from vents, mineral-laced steam drifting across boardwalks, and the wet-metal tang of hot springs that have been boiling since before recorded history. Bison block the road with no urgency. Mud pots gurgle. Grand Prismatic Spring shifts from sapphire to emerald to burnt orange as thermophilic bacteria paint its edges in living colour. The ground beneath your feet is not finished forming.
Yellowstone sits atop a supervolcano whose magma chamber powers over ten thousand geothermal features β the highest concentration on Earth. Grand Prismatic Spring is larger than a football field and changes hue with the seasons as its heat-loving microorganisms respond to temperature shifts. Old Faithful erupts within a ten-minute window roughly every ninety minutes, but it is the Lamar Valley that delivers the park's most primal experience: the highest density of grey wolves in the lower forty-eight states, visible from roadside pullouts at dawn without a guide. The park spans portions of Wyoming, Montana, and Idaho, covering an area larger than Rhode Island and Delaware combined. Yellowstone was established as the world's first national park in 1872, setting the precedent for the entire global conservation movement.
Family
Old Faithful's predictable eruptions give families a centrepiece to plan around, and the boardwalk loops through geyser basins are accessible to all ages. Wildlife spotting from the car in Lamar Valley turns the drive into a safari.
Couple
Watch wolves hunt at dawn in the Lamar Valley, soak in the Boiling River where hot springs meet the Gardner River, and stay in the log-and-stone Old Faithful Inn β one of the largest log structures ever built.
Friends
Backcountry camping, multi-day hikes through geyser country, and the sheer variety of terrain β from petrified forests to the Grand Canyon of the Yellowstone β make this one of the best group adventure destinations in the country.
Bison burgers at the Old Faithful Inn, grilled over an open flame.
Huckleberry pie with a lattice crust from a roadside bakery outside the West entrance.
Campfire trout pulled from the Yellowstone River an hour before dinner.

Γland
Sweden
A windmill-studded limestone steppe connected to the mainland by Europe's longest bridge.

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

Peneda-GerΓͺs
Portugal
Portugal's only national park β granite canyons, wild Garrano horses, and Roman milestones along 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
Four-hundred-foot sand dunes plunging directly into the turquoise shallows of Lake Michigan.

Acadia National Park
United States
First sunrise in America hitting pink granite while waves explode in Thunder Hole.

Watkins Glen
United States
Nineteen waterfalls inside a gorge so narrow you can touch both walls at once.