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A feature on Zion National Park, a kingdom of towering rocks, deep canyons, and sandstone walls.
Footage of the remote desert of Arizona, including the state's canyons, towering cliffs and fossilized dunes.
The Bahamas are home to migratory birds, green turtles, and rock iguanas.
The Niagara Escarpment Biosphere Reserve begins with the mighty Niagara Falls and winds its way through deep valleys and caves.
Lake Superior has the longest undeveloped shoreline of Canada's Great lakes.