Pyramid I, Calakmul, UNESCO World Heritage Site, Calakmul Biosphere Reserve, the largest tropical forest reserve in Mexico, Campeche, Mexico, North America

Mayan ruins, Calakmul, UNESCO World Heritage Site, Calakmul Biosphere Reserve, the largest tropical forest reserve in Mexico, Campeche, Mexico, North America

Millions of butterflies covering trees, Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Millions of butterflies covering trees, Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Close up of Monarch butterflies (Danaus plexippus), Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Millions of butterflies covering trees, Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Millions of butterflies covering trees, Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Monarch Butterfly Biosphere Reserve, UNESCO World Heritage Site, El Rosario, Michoacan, Mexico, North America

Aerial of Sian Ka'an Biosphere Reserve, UNESCO World Heritage Site, Quintana Roo, Mexico, North America

Reservoir in the mountain community and tourist centre of Las Terrazas, Sierra del Rosario Nature and Biosphere Reserve, UNESCO World Heritage Site, Cordillera de Guaniguanico, Pinar del Rio, Cuba, West Indies, Central America

Aerial of Sian Ka'an Biosphere Reserve, UNESCO World Heritage Site, Quintana Roo, Mexico, North America

Aerial of Sian Ka'an Biosphere Reserve, UNESCO World Heritage Site, Quintana Roo, Mexico, North America

Aerial of Sian Ka'an Biosphere Reserve, UNESCO World Heritage Site, Quintana Roo, Mexico, North America

Aerial of Sian Ka'an Biosphere Reserve, UNESCO World Heritage Site, Quintana Roo, Mexico, North America

The Grey Glacier and Lago Grey in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

The jaggedly sculpted face of the Grey Glacier on Lago Grey in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

A morning view of the Paine Massif across Lago Pehoe in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

The Grey Glacier and Lago Grey in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

The jaggedly sculpted face of the Grey Glacier on Lago Grey in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

The Grey Glacier and Lago Grey in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America.

The rocky shoreline of Lago Pehoe in Torres del Paine National Park, a UNESCO World Biosphere Reserve in Chile in the Patagonia region of South America. Across the lake is the Paine Massif in the low clouds.

Tourists walking in the dunes, UNESCO World Biosphere Reserve, Slowinski National Park, Polish Baltic Sea coast, Leba, Pomeranian, Poland

Tourists walking in the dunes, UNESCO World Biosphere Reserve, Slowinski National Park, Polish Baltic Sea coast, Leba, Pomeranian, Poland

Middle Spotted Woodpecker (Dendrocopos medius) sitting on the dropped antler of a red deer (Cervus elaphus), Biosphaerengebiet Schwaebische Alb UNESCO Biosphere Reserve, Baden-Wuerttemberg, Germany, Europe

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chicks (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Great Spotted Woodpecker (Dendrocopos major) sitting on hazel (Corylus avellana), surrounded by male catkins, Biosphaerengebiet Schwaebische Alb UNESCO Biosphere Reserve, Baden-Wuerttemberg, Germany, Europe

Great Spotted Woodpecker (Dendrocopos major) sitting on the dropped antler of a red deer (Cervus elaphus), Biosphaerengebiet Schwaebische Alb UNESCO Biosphere Reserve, Baden-Wuerttemberg, Germany, Europe

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chicks (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Flock of Domestic Sheep (Ovis ammon f. aries) grazing at a dyke, Mecklenburg Elbe Valley Nature Park, UNESCO Elbe River Landscape Biosphere Reserve, Mecklenburg-Western Pomerania, Germany, Europe

Black Woodpecker (Dryocopus martius) at nest hole in a beech with chick (Fagus sylvatica), Biosphaerenreservat Schwaebische Alb or Swabian Mountains Biosphere Reserve, UNESCO World Heritage Site, Baden-Wuerttemberg, Germany, Europe

Giant Queen Victoria water lily (Victoria amazonica), Pantanal, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Primeval forest in the Vessertal valley, Biosphaerenreservat Vessertal-Thueringer Wald, biosphere reserve Vesser valley-Thuringian Forest, Thuringia, Germany, Europe

Parinacota volcano reflecting in the Chungara lake, Lauca national park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

Hawfinch (Coccothraustes coccothraustes), male in breeding plumage, perched on apple tree branch, UNESCO Biosphere Reserve, Swabian Alb, Baden-Wuerttemberg, Germany, Europe

Giant Queen Victoria water lily (Victoria amazonica), Pantanal, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Pousada Piuval, Pantanal landscape, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Parinacota volcano reflecting in the Chungara lake, Lauca national park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

Giant Queen Victoria water lily (Victoria amazonica), Pantanal, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Parinacota volcano reflecting in the Chungara lake, Lauca National Park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

Fisherboat, Cuiaba river, Pantanal, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Parinacota volcano reflecting in the Chungara lake, Lauca National Park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

Primeval forest in the Vessertal valley, Biosphaerenreservat Vessertal-Thueringer Wald, biosphere reserve Vesser valley-Thuringian Forest, Thuringia, Germany, Europe

Transpantaneira, Wooden Bridge, Pantanal, UNESCO World Heritage Site and Biosphere reserve, Mato Grosso, Brazil

Parinacota volcano, Lauca national park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

Parinacota volcano reflecting in the Chungara lake, Lauca National Park, UNESCO Biosphere Reserve, Arica and Parinacota Region, Chile, South America

A human hand reaches out towards a newborn gray whale calf (Eschrichtius robustus) swimming near the surface with its mother in Laguna San Ignacio, on the Pacific coast of Baja California Sur, Mexico. Designated as a UNESCO World Heritage site and part of the Vizcaino Biosphere Reserve, it is the last undeveloped gray whale birthing lagoon on the planet, Mexico

Tourists explore the natural salt flats on the shores of Laguna San Ignacio, Baja California Sur, Mexico. In 2000, thanks to national and international pressure, the Mexican government cancelled a joint venture with Mitsubishi subsidiary ESSA (Exportadora de Sal, S.A) to establish the largest industrial salt evaporation facility in the world. Designated as a UNESCO World Heritage site and part of the Vizcaino Biosphere Reserve, the lagoon is the last undeveloped gray whale birthing area on the planet, Mexico

A newborn gray whale calf (Eschrichtius robustus) surfaces in Laguna San Ignacio, on the Pacific coast of Baja California Sur, Mexico. Designated as a UNESCO World Heritage site and part of the Vizcaino Biosphere Reserve, it is the last undeveloped gray whale birthing lagoon on the planet, Mexico

Lough Leane, Ross Castle, Killarney National Park, County Kerry, Ireland

Ladies View, Killarney National Park, Ring Of Kerry, County Kerry, Ireland

Ladies View, Killarney National Park, Ring Of Kerry, County Kerry, Ireland