A cyclist on Signal Hill overlooking Cape Town, South Africa.
A boy listens to music on a portable tape player in rural Flatville, Illinois.
A mountain biker and tire tracks that threaten to destroy living desert crust near Arches National Park, Utah.
A girl speeds by on her bicycle with training wheels.
Fields are irrigated with water from the Columbia River system in Idaho.
Mountain bikers stop for a quick rest on the trails in Aspen, Colorado.
Mountain bikers on Slickrock Trail on BLM land near Moab, Utah.
A woman takes a rest on Slickrock Trail on BLM land near Moab, Utah.
Slickrock Trail on BLM land near Moab, Utah.
Tracks left by mountain bikers on Slickrock Trail on BLM land near Moab, Utah.
Mountain biker on Slickrock Trail on BLM land near Moab, Utah.
A bike/bus trail stretches seven miles along Everglades National Park.
Cyclists silhouetted in front of Mount McKinley in Denali National Park, Alaska.
Ellen Sartore on her bicycle (Nebraska).
Bike trail in Lincoln, Nebraska.
Passing by the Washington Monument at sunrise.
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