Ralph Pace / Bottlenose Dolphin (Tursiops truncatus) and diver, Revillagigedo Islands, Mexico

Chase Dekker / Hiker near waterfall and basalt columns, Svartifoss Waterfall, Skaftafell National Park, Iceland

Chase Dekker / Hikers near glacial lake, Moraine Lake, Banff National Park, Alberta, Canada

Chase Dekker / Hiker at waterfall, Kirkjufellsfoss, Snaefellsnes Peninsula, Iceland

Chase Dekker / Hiker at coastline, Garrapata State Beach, California

Chase Dekker / Hiker and mountain, Eiger, Switzerland

Chase Dekker / Hiker at Delicate Arch in winter, Arches National Park, Utah

Tim Fitzharris / Snorkeler in fish school, Philippines

Ralph Pace / Gray Whale (Eschrichtius robustus) touched by tourist, Baja California, Mexico

Gary Bell/ Oceanwide / Snorkelers in tropical lagoon, Keeling Islands, Australia

Gary Bell/ Oceanwide / Snorkelers in tropical lagoon, Keeling Islands, Australia

Gary Bell/ Oceanwide / Tourists sea kayaking, Whitsunday Island, Queensland, Australia