Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

View of the circle of mountains, location of the historic and archaeological Nabataean city of Petra, UNESCO World Heritage Site, Jordan, Middle East

Colossal statues of King Ramses II, Abu Simbel, UNESCO World Heritage Site, Egypt, North Africa, Africa

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Aerial of Ouara, former capital of the Ouaddai Empire, Chad

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guests from the Lindblad Expeditions ship National Geographic Sea Bird in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Wardour Castle, a 14th Century castle at Wardour, near Tisbury, Wiltshire, England, United Kingdom

Aerial view of the Site of Hegra (Madain Salih), UNESCO, in the area of AlUla, Medina Province, Saudi Arabia

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

The National Geographic Endeavour II at anchor on Bartolome Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina

Cueva de las Manos del Rio Pinturas, Cave of the Hands, Patagonia, Province of Santa Cruz, Argentina