Burren National Park, Ireland. A participant portages his canoe during an adventure event in W.Va. called PHEAR. <br/>The grueling 24-hour race features canoeing, mountain biking and running. Antelope Canyon, Page, Ariz. Father and son spend time together on Cape Cod. Sunset on the island of Bonaire. Tourists climb the Vatican Museum staircase in Rome. Hundreds of tourists visit the museum each day. Bonaire salt flats. Praying mantis visits my house. Low tide on Cape Cod. Canals of Venice, Italy. The Flume, N.H. and Olympic National Park, Wash. Santorini, Greece. Downtown Bonaire. A cyclist enjoys Greenwich Point Park, Conn. Hikers enjoy Wall Street at Zion National Park and Bryce Canyon National Park. Buffalo roam the hills of Custer State Park in the Black Hills National Forest, S.D. A rock climber at Smith Rocks State Park, Ore. Olympic National Park, Wash. Aspens near Durango in Colo. and a lone tree at Custer State Park, S.D. A family looks onto Buffalo Gap National Grassland in Kadoka, S.D.