Expedition tourists follow a marked route on Half Moon Island, view to Livingston Island, South Shetland Islands, Antarctica, Polar Regions

Road Sign warning of bends in road, Red Centre, Australia

Road Sign for bend in road, Red Centre, Australia

Hikers follow a route along the Colorado River that connect Tapeats Creek and Thunder River to Deer Creek in the Grand Canyon outside of Fredonia, Arizona November 2011. The 21.4-mile loop starts at the Bill Hall trailhead on the North Rim and descends 2000-feet in 2.5-miles through Coconino Sandstone to the level Esplanada then descends further into the lower canyon through a break in the 400-foot-tall Redwall to access Surprise Valley. Hikers connect Thunder River and Tapeats Creek to a route along the Colorado River and climb out Deer Creek.

Hikers follow a route along the Colorado River that connect Tapeats Creek and Thunder River to Deer Creek in the Grand Canyon outside of Fredonia, Arizona November 2011. The 21.4-mile loop starts at the Bill Hall trailhead on the North Rim and descends 2000-feet in 2.5-miles through Coconino Sandstone to the level Esplanada then descends further into the lower canyon through a break in the 400-foot-tall Redwall to access Surprise Valley. Hikers connect Thunder River and Tapeats Creek to a route along the Colorado River and climb out Deer Creek.