The turquoise glacial lakes of the Canadian Rockies — Moraine Lake beneath the Valley of the Ten Peaks and nearby Lake Louise — where glacier-ground rock flour turns the water an electric blue-green beneath snow-capped mountains.
One of the most staggering landscapes on Earth — a mile-deep, 446-kilometre-long chasm where the Colorado River has laid bare nearly two billion years of the planet's history in bands of coloured rock.
Not the tallest falls, but among the most powerful on Earth — three waterfalls on the Niagara River between the Great Lakes, where a colossal volume of water plunges over a cliff in a permanent roar of mist.
The world's first national park, sitting atop a giant volcanic hotspot — home to half the planet's geysers, rainbow-rimmed hot springs like Grand Prismatic, and vast wildlife-rich valleys of bison, wolves, and bears.
A glacier-carved granite valley of sheer cliffs and thundering waterfalls in California's Sierra Nevada — home to the monoliths of El Capitan and Half Dome, and groves of giant sequoias, the largest trees on Earth.