A woman with a large backpack walking through a forest. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284600/free-photo-image-woman-hiking-people-nature-jungleFree Image from public domain licenseFall Hiking. Fall at Devil's Lake State Park in Wisconsin. Original public domain image from Flickr https://www.rawpixel.com/image/4025597/photo-image-tree-plant-leafFree Image from public domain licenseHikers at Cutbank Pass Panorama. Original public domain image from Flickr https://www.rawpixel.com/image/3312494/free-photo-image-hiking-landscape-travelling-destinationFree Image from public domain licenseAbineau Trail No. 127Fall color September 25, 2016 along Abineau Trail https://www.rawpixel.com/image/3394095/free-photo-image-tree-spring-autumn-forestFree Image from public domain licenseDogs, Cooper and Kody, take a break amidst an amazing vista in the Okanogan Wenatchee National Forest, Washington. Original… https://www.rawpixel.com/image/3388325/free-photo-image-landscape-forest-outdoors-skyFree Image from public domain licenseCouple watching the sunset, Tongass National Forest. Original public domain image from Flickr https://www.rawpixel.com/image/3388168/free-photo-image-people-nature-couple-travelFree Image from public domain licenseHikers take in the views from Buffalo Plateau. Original public domain image from Flickr https://www.rawpixel.com/image/4032577/photo-image-cloud-tree-peopleFree Image from public domain licenseGreen Mountain Trail, Mt. Baker-Snoqualmie National Forest. Original public domain image from Flickr https://www.rawpixel.com/image/8732273/photo-image-plant-tree-public-domainFree Image from public domain licenseHiking the Lake Abundance Trail from Daisy Pass by Jacob W. Frank. Original public domain image from Flickr https://www.rawpixel.com/image/4225729/photo-image-public-domain-nature-peopleFree Image from public domain licenseA person standing on a leaf covered walking trail in a forest at Lula Lake Land Trust. Original public domain image from… https://www.rawpixel.com/image/3283269/free-photo-image-nature-human-men-hiking-adventureFree Image from public domain licenseBackbone Trail - Hikers. Hikers in a line. Original public domain image from Flickr https://www.rawpixel.com/image/3394475/free-photo-image-forest-backbone-trail-bushFree Image from public domain licenseView on Apache Lake, Sierra Blanca Range, Arizona, Two Apache Scouts in the Foreground by Timothy O'Sullivan https://www.rawpixel.com/image/9045979/photo-image-plant-person-treeFree Image from public domain licenseLow-angle shot of a foggy forest. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3299808/free-photo-image-jungle-art-cc0Free Image from public domain licenseMist over dark green woods in Roseburg. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3291429/free-photo-image-abies-cc0-cloud-pictures-imagesFree Image from public domain licenseA man wearing jeans and a backpack walking down a trail through the Muir Woods. Original public domain image from Wikimedia… https://www.rawpixel.com/image/3285158/free-photo-image-wallpaper-png-hiking-walking-bridge-natureFree Image from public domain licenseSun shines over autumn leaves on trees in the forest. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283871/free-photo-image-leaves-autumn-birchFree Image from public domain licenseSaugatuck, United States. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284140/free-photo-image-walk-wood-forest-treeFree Image from public domain licenseWoman exploring the forest. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284602/free-photo-image-hiking-wallpaper-grass-exploreFree Image from public domain licenseColored Sunset. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285441/free-photo-image-forest-land-and-sky-people-travelingFree Image from public domain licenseHanging bridge. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285444/free-photo-image-stock-perspective-tropicalFree Image from public domain licenseA mountaineer's outstretched legs on a rocky ridge. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3285825/free-photo-image-shoes-nature-rock-climb-climbing-top-viewFree Image from public domain licenseArrival at the top of Bear Mountain. Original public domain image from Flickr https://www.rawpixel.com/image/3388282/free-photo-image-adventure-bear-mountain-boardFree Image from public domain licenseDesert plant in Santa Rosa Mountain Wilderness. Original public domain image from Flickr https://www.rawpixel.com/image/4026826/photo-image-flowers-tree-plantFree Image from public domain licenseHydrologist Denise Dammann leads one of many lessons in stream health and erosion during the Glendale Outdoor School session… https://www.rawpixel.com/image/9647768/photo-image-face-plant-grassFree Image from public domain licenseOcotillo flower desert plant background. Original public domain image from Flickr https://www.rawpixel.com/image/4026828/photo-image-background-flower-lightFree Image from public domain licenseU.S. Department of Agriculture (USDA) Forest Service (FS) Smith River Hotshot Forestry Technicians move hike along fire… https://www.rawpixel.com/image/3306885/free-photo-image-backpack-bag-cc0Free Image from public domain licenseHiking Timberline trail, Mt Hood National Forestrecreation hiking Timberline trail, Mt Hood National Forest. Original public… https://www.rawpixel.com/image/4057842/photo-image-public-domain-tree-natureFree Image from public domain licenseCamp Creek National Recreation Trail. Original public domain image from Flickr https://www.rawpixel.com/image/4026827/photo-image-tree-botanical-personFree Image from public domain licenseFall Hiking. Fall at Devil's Lake State Park in Wisconsin. Original public domain image from Flickr https://www.rawpixel.com/image/4025585/photo-image-tree-plant-leafFree Image from public domain licenseHeading up for a winter hike to donut Falls on the Uinta-Wasatch-Cache National Forest east of Salt Lake City, Utah, USA.… https://www.rawpixel.com/image/4035081/photo-image-tree-woods-personFree Image from public domain licenseSauk River from the Old Sauk Trail, Mt. Baker-Snoqualmie National Forest. Original public domain image from Flickr https://www.rawpixel.com/image/8732257/photo-image-plant-tree-public-domainFree Image from public domain licenseTongass National Forest. Original public domain image from Flickr https://www.rawpixel.com/image/3388243/free-photo-image-mountain-hike-adventure-cc0Free Image from public domain licenseBackpacker hiking the Hellroaring Creek trail in the Absaroka Beartooth Wilderness, USA. Original public domain image from… https://www.rawpixel.com/image/4032647/photo-image-background-flower-treeFree Image from public domain licenseA narrow, forest road surrounded by evergreen trees in Crescent. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3284871/free-photo-image-cc0-countryside-creative-commonsFree Image from public domain licenseHiking past the head of Lake Abundance. Original public domain image from Flickr https://www.rawpixel.com/image/4032662/photo-image-background-wood-peopleFree Image from public domain licenseWillamette National Forest, Backpackers hiking trail. Original public domain image from Flickr https://www.rawpixel.com/image/4057719/photo-image-flower-public-domain-personFree Image from public domain licenseCrowders Moutain, United states. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3283219/free-photo-image-road-sign-cc0-countrysideFree Image from public domain licenseViews of the Coyote Creek headwaters in Absaroaka Beartooth Wilderness by Jacob W. Frank. Original public domain image from… https://www.rawpixel.com/image/4226121/photo-image-public-domain-tree-plantFree Image from public domain licenseSierra Hot Shots hike into the El Dorado National Forest, California. Original public domain image from Flickr https://www.rawpixel.com/image/8732186/photo-image-fire-public-domain-peopleFree Image from public domain licenseGreen Mountain Trail, Mt. Baker-Snoqualmie National Forest. Original public domain image from Flickr https://www.rawpixel.com/image/8732253/photo-image-tree-public-domain-mountainFree Image from public domain licenseA backpacker on the Alpine 7 trail takes a moment to enjoy the view of Warrior Mountain, Flathead National Forest, Montana.… https://www.rawpixel.com/image/8732238/photo-image-cloud-plant-treeFree Image from public domain licenseHiking, forest adventure field trip. Original public domain image from Flickr https://www.rawpixel.com/image/8752764/photo-image-public-domain-nature-forestFree Image from public domain licenseFirefighters, rescue team hiking, forest fire. Original public domain image from Flickr https://www.rawpixel.com/image/8732222/photo-image-public-domain-people-natureFree Image from public domain licenseLa Serrana, Colombia. Original public domain image from Wikimedia Commons https://www.rawpixel.com/image/3291542/free-photo-image-colombia-forest-abiesFree Image from public domain licensePanorama (left hand part) from Mt Waiopehu .... (04 December 1927) by Leslie Adkin. https://www.rawpixel.com/image/13028567/photo-image-sky-head-vintage-forestFree Image from public domain licenseThe A.B. Young Trail leaves from the southernmost end of the Bootlegger Picnic Area in Oak Creek Canyon north of Sedona… https://www.rawpixel.com/image/9648528/photo-image-plant-fire-leavesFree Image from public domain licenseInner Basin Trail No. 29Fall color on Inner Basin Trail along the Waterline Road section of the trail, October 5, 2016 https://www.rawpixel.com/image/3394078/free-photo-image-road-trees-forest-trail-arizonaFree Image from public domain licenseBurnt CPA-Peeples-Lesley Starke hiking. Original public domain image from Flickr https://www.rawpixel.com/image/3326156/free-photo-image-environment-research-biodiversity-biologistFree Image from public domain licenseInner Basin Trail No. 29Fall color on Inner Basin Trail, October 5, 2016 https://www.rawpixel.com/image/3394082/free-photo-image-forest-arizona-aspensFree Image from public domain licenseA skier is dusted from falling snow from a tree. Original public domain image from Flickr https://www.rawpixel.com/image/4032605/photo-image-background-light-treeFree Image from public domain licenseBrins Mesa No. 119. Cactus blooming along the trail. Original public domain image from Flickr. https://www.rawpixel.com/image/3394094/free-photo-image-arizona-bloom-blossomFree Image from public domain licenseWest Clear Creek Trail #17 provides the only marked and maintained access to the lower reaches of West Clear Creek… https://www.rawpixel.com/image/3394071/free-photo-image-arizona-bloom-blossomFree Image from public domain licensePerson and dog hiking below trees in fall color and creek on Peaked Mountain in the Adirondack Park, North River, NY, on Oct… https://www.rawpixel.com/image/9647851/photo-image-dog-face-treeFree Image from public domain licenseBarbershop Trail No. 91.Arizona tree squirrel.Original public domain image from Flickr https://www.rawpixel.com/image/3394089/free-photo-image-animal-arizona-tree-squirrelFree Image from public domain licenseYuki WildernessThe ancient forests of the Yuki Wilderness consist of ponderosa pine, Douglas fir, Shasta red fir, white fir… https://www.rawpixel.com/image/9647655/photo-image-flower-plant-grassFree Image from public domain licenseBarbershop Trail No. 91.Variegated Fritillary.Credit: U.S. Forest Service, Coconino National Forest. Original public domain… https://www.rawpixel.com/image/3394046/free-photo-image-botanical-flowers-animal-arizonaFree Image from public domain license