Nisyros volcano view, Nisyros Island, Dodecanese Islands, Greek Islands, Greece, Europe

Guest from the Lindblad Expeditions ship National Geographic Sea Bird behind a mushroom or toadstool in Southeast Alaska, United States of America, North America

Mount Fuji San, UNESCO World Heritage Site, iconic volcano, with vibrant autumn foliage in front of a blue lake, Honshu, Japan, Asia

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) with tourists in the background, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The sheer cliff of the Red Wall along the North Kaibab Trail, Grand Canyon North Rim, UNESCO, Arizona, United States of America

Black Spiny-tailed iguana (Ctenosaura similis), on New River near Lamanai, Belize

Dry waterfall cliffs, Johnson Canyon between Bainbridge Steel and Stone Dams near Ash Fork, Kaibab National Forest, Arizona, United States of America

Aerial view taken by drone of iceberg in Jokusarloon Glacier Lagoon during a summer day, Iceland, Polar Regions

Drone aerial view of Kriaritsi project area with abandoned roads in the south of Greece, Sithonia, Chalkidiki, Greece

Adult brown bear (Ursus arctos) skeletal remains on Chichagof Island, Alaska, United States of America

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

Reflected images of guests from the Lindblad Expedition ship National Geographic Endeavour on Zodiac tour around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour in LeMaire Channel on the western side of the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour in LeMaire Channel on the western side of the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour in LeMaire Channel on the western side of the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour on approach at sunset to the Falkland Islands, South Atlantic Ocean

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

National Geographic photographer Joel Sartore with guests from the Lindblad Expedition ship National Geographic Endeavour on Torgeson Island near the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in and around the Antarctic peninsula in Antarctica

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in and around the Antarctic peninsula in Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour on approach at sunset to the Falkland Islands, South Atlantic Ocean

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour in LeMaire Channel on the western side of the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in Whalers Bay inside the caldera of Deception Island in the South Shetland Islands, Antarctica

The Lindblad Expedition ship National Geographic Endeavour celebrates crossing the Antarctic Circle

Natural history staff from the Lindblad Expedition ship National Geographic Endeavour doing various things in and around the Antarctic Peninsula

The Lindblad Expedition ship National Geographic Endeavour operating in and around the Antarctic peninsula in Antarctica

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

The Lindblad Expedition ship National Geographic Endeavour operating in and around South Georgia, Southern Ocean

The Lindblad Expedition ship National Geographic Endeavour operating in and around the Antarctic peninsula in Antarctica

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

The Lindblad Expedition ship National Geographic Endeavour operating in and around South Georgia, Southern Ocean

The Lindblad Expedition ship National Geographic Endeavour celebrates crossing the Antarctic Circle

Guests from the Lindblad Expedition ship National Geographic Endeavour, Antarctica

The Lindblad Expedition ship National Geographic Endeavour operating in and around South Georgia, Southern Ocean

The Lindblad Expedition ship National Geographic Endeavour celebrates crossing the Antarctic Circle

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

Aerial views of El Castillo and the Ruins of the Mayan temple grounds at Tulum, Quintana Roo, Yucatan, Mexico. Tulum is the site of a pre-Columbian Mayan walled city which served as a major port for Coba, in the Mexican state of Quintana Roo. The ruins are situated on 12 meter 39 ft tall cliffs along the east coast of the Yucatán Peninsula on the Caribbean Sea in the state of Quintana Roo, Mexico. Tulum was one of the last cities built and inhabited by the Maya; it was at its height between the 13th and 15th centuries and managed to survive about 70 years after the Spanish began occupying Mexico. Old World diseases brought by the Spanish settlers appear to have resulted in very high fatalities, disrupting the society, and eventually causing the city to be abandoned.

A young man crouches next to a small stream running through a forest in Upcountry Maui, Maui, Hawaii, United States of America