Chapman's Baobab, claimed to be the largest tree in Africa at 25 metres around, camped under and measured by early explorers Chapman, Baines, Livingstone and others. Makgadikgadi Pans National Park, Botswana, Africa

Chapman's Baobab, claimed to be the largest tree in Africa at 25 metres around, camped under and measured by early explorers Chapman, Baines, Livingstone and others. Makgadikgadi Pans National Park, Botswana, Africa

Gravestone from the Franklin expedition, Beechey island, Nunavut, Canadian Arctic, Canada, North America

Statue of Alexander Humboldt lit by early morning sun, Humboldt University, Unter den Linden, Historic Mitte, Berlin, Germany, Europe

Sunrise on Andvord bay, located in the Graham island discovered in early XXth century by the belgian explorator Adrien de Gerlache. Cruise on board Exploris One. Antarctic.

Landscape of Svalbard in Norway, also known as Spitsbergen. This territory stretches from latitude 75 to 80 degrees to the pack ice a few hundred kilometers from the North Pole. Melting ice, early global warming. Front of a glacier fracturing at the edge of a fjord. Explorers' sailboat at the ice edge

Landscape of Svalbard in Norway, also known as Spitsbergen. This territory stretches from latitude 75 to 80 degrees to the pack ice a few hundred kilometers from the North Pole. Melting ice, early global warming. Front of a glacier fracturing at the edge of a fjord.