Scott Leslie / Boardwalk through swamp, Okefenokee National Wildlife Refuge, Georgia

Laurent Geslin / Landscape of Lake Leman at night, viewed through gateway. December 2009.

Scott Leslie / Boardwalk in old-growth forest, Kejimkujik National Park, Nova Scotia, Canada

David Noton / Panoramic of jetty at Weary Bay, Cape Tribulation, Queensland, Australia

Mike Read / Boardwalk through Dersingham Bog National Nature Reserve, Sandringham Estate, Norfolk, England, UK. August 2018.

Sven Zacek / Hiking trail with boardwalk and viewing platform over frozen bog pools, aerial view. Endla Nature Reserve, Jogevamaa, Central Estonia. December 2016.

Guy Edwardes / Long exposure of river of Vintgar Gorge with boardwalk, Bled, Slovenia. July 2016

Ashley Cooper / Wildlife photographer taking pictures of Antarctic Fur Seal (Arctocephalus gazella) female on Prion Island, South Georgia, Southern Ocean.

Ashley Cooper / A female Antarctic Fur Seal (Arctocephalus gazella) on Prion Island, South Georgia, Southern Ocean, with a sign requesting visitors to remain on the boardwalk.

Ashley Cooper / Tourists overlooking the Peyto Lake, Banff National Park, Canadian Rockies, Alberta, August 2012.

Ashley Cooper / Mangrove swamp at high tide in Cairns with board walk, Queensland, Australia, February 2010.

Sebastian Kennerknecht / Fishing Cat (Prionailurus viverrinus) male running over bridge in urban wetland at night, Diyasaru Park, Colombo, Sri Lanka