A summer snowstorm swirls around evergreen trees in Waterton-Glacier International Peace Park, a partnership between Glacier National Park in the United States and Waterton Lakes National Park in Canada.
PHOTOGRAPH BY MICHAEL MELFORD, NAT GEO IMAGE COLLECTION
In this picture from the May 1969 issue, children watch the Christmas Eve broadcast from Apollo 8 astronauts in space. The crew was the first to successfully orbit the moon and return to Earth.
PHOTOGRAPH BY BRUCE DALE, NAT GEO IMAGE COLLECTION
A lone bison stands in snow-covered Yellowstone National Park. The bison's skin, fat reserves, and fur coat make it especially suited to survive temperatures as low as minus 40 degrees Fahrenheit and winds as wild as 50 miles an hour.
PHOTOGRAPH BY SARAH LEEN, NAT GEO IMAGE COLLECTION
In Telfs, Austria, men dress up in suits of tree lichen during Schleicherlaufen, a festival held every five years that celebrates winter's end. The origins of the festival are unclear, but can be traced back to the 16th century.
PHOTOGRAPH BY MELISSA FARLOW, NAT GEO IMAGE COLLECTION
Twenty tons of fireworks explode over Sydney Harbour at midnight, ringing in the year 2000. The cover story for the August 2000 issue celebrated the city as it hosted the Summer Olympics.
PHOTOGRAPH BY ANNIE GRIFFITHS, NAT GEO IMAGE COLLECTION
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