Rainforest Boardwalk
Michael Szoenyi/science Photo Library
Boardwalk Over Marshland
Cordelia Molloy/science Photo Library
Couple On Boardwalk On Holiday
Ruth Jenkinson
The Nobbies Boardwalk And Seal Rocks
I. Noyan Yilmaz/science Photo Library
Mature Woman On Boardwalk
Ruth Jenkinson
Catwalk National Recreation Area
Jim West/science Photo Library
Walkway In A Nature Reserve
Jim West
Forest Walkway
Tony Craddock/science Photo Library
Maumee Bay State Park #2
Jim West/science Photo Library
Yellowstone National Park #1
Jim West
Wetlands In Winter
Jim West
Repairing Hurricane Katrina Damage #2
Jim West
Sawgrass Prairie
Jim West
Walkway In A Nature Reserve #1
Jim West
Photographer In A Nature Reserve
Jim West
Yellowstone National Park #7
Jim West
Visitors In A Nature Reserve
Jim West
Yellowstone National Park #9
Jim West
Mount Bierstadt Hiking Trail #2
Jim West
Yellowstone National Park #14
Jim West
Mount Bierstadt Hiking Trail #4
Jim West
Nature Trail And Lava Flow
Jim West
Bamboo Forest
Michael Szoenyi/science Photo Library
Pond In Meadow
Lizzie Harper/science Photo Library
Recycling Bins On Canaveral Seashore
Mark Williamson/science Photo Library
Galien River Marsh
Jim West/science Photo Library
Galien River Marsh #1
Jim West/science Photo Library
Walkway To Bodie Island Lighthouse
Michael Szoenyi/science Photo Library
Alpine Meadow Conservation
Peter Falkner/science Photo Library
Galien River Marsh #2
Jim West/science Photo Library
Walkway To Bodie Island Lighthouse #1
Michael Szoenyi/science Photo Library
Maumee Bay State Park #1
Jim West/science Photo Library
Badlands National Park In Winter #5
Jim West/science Photo Library
Badlands National Park In Winter #6
Jim West/science Photo Library
Tropical Storm #1
Jim Reed/science Photo Library
Warning Sign On Florida Beach
Mark Williamson/science Photo Library
Bridge In Fog
Wladimir Bulgar/science Photo Library
Yellowstone National Park #6
Jim West
Repairing Hurricane Katrina Damage #8
Jim West
Maumee Bay State Park
Jim West/science Photo Library
Galien River Marsh #3
Jim West/science Photo Library
Nature Reserve Boardwalk #1
Duncan Shaw
Nature Reserve Boardwalk
Duncan Shaw
Sandals On A Beach, Spain
Carlos Dominguez
Sunloungers On A Beach, Spain
Carlos Dominguez
Pavement Lined With Palm Trees, Spain
Carlos Dominguez
Painted Hills, John Day Fossil Beds #2
Science Photo Library
Children On A Boardwalk
Sinclair Stammers/science Photo Library