Gavin Hellier / Ancient carved stone heads of the gods, the god Antiochus, Nemrut Dagi (Nemrut Dag), on the summit of Mount Nemrut, UNESCO World Heritage Site, Cappadocia, Anatolia, Turkey, 2008

Oriol Alamany / Moai face at the restored archaeological site of Ahu Ko Te Riku in Tahai Ceremonial Center in Hanga Roa, Easter Island (Pascua or Rapa Nui), Unesco World Heritage Site, November 2004

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) with tourists, vulnerable, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) with female tourist, vulnerable, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) with tourists, vulnerable, Fernandina Island, Galapagos Islands, Ecuador

Pete Oxford / Masked Booby (Sula dactylatra) nesting colony observed by tourists from inflatable boat, Genovesa Island, Galapagos Islands, Ecuador

Pete Oxford / Masked Booby (Sula dactylatra) nesting colony observed by tourists from inflatable boat, Genovesa Island, Galapagos Islands, Ecuador

Pete Oxford / Palo Santo (Bursera graveolens) tree ringed bay with tourists, Floreana Island, Galapagos Islands, Ecuador

Fred Bavendam / Yellowfin Goatfish (Mulloides vanicolensis) school near coral reef observed by scuba diver, often gather in large schools during the day and disperse at night to feed, Great Barrier Reef, Queensland,...

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) group with tourists in shallow water, Monkey Mia, Australia

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) group with tourists in shallow water, Monkey Mia, Australia

Flip Nicklin / Bottlenose Dolphin (Tursiops truncatus) group interacting with tourists, Monkey Mia, Australia

Norbert Wu / Reef-walking, Great Barrier Reef, Heron Island, Australia

Flip Nicklin / Dwarf Minke Whale (Balaenoptera acutorostrata) investigates researchers and tourists attached to line, near the Great Barrier Reef, Australia