A well-worn stairway leads to a house on Oahu’s North Shore, November 1979.Photograph by Robert Madden, National Geographic

A well-worn stairway leads to a house on Oahu’s North Shore, November 1979.Photograph by Robert Madden, National Geographic

Embracing the fjord, a dusk-dimmed Bergen laps against mountain walls, Norway, 1971Photograph by George F. Mobley, National Geographic

Embracing the fjord, a dusk-dimmed Bergen laps against mountain walls, Norway, 1971Photograph by George F. Mobley, National Geographic

A fortune teller displays her cards in Jemaa el Fna square in Marrakesh, Morocco, June 1971.Photograph by Thomas J. Abercrombie, National Geographic

A fortune teller displays her cards in Jemaa el Fna square in Marrakesh, Morocco, June 1971.Photograph by Thomas J. Abercrombie, National Geographic

During a motorcycle race, speedsters careen into a turn in Sweden, August 1973.Photograph by Albert Moldvay, National Geographic

During a motorcycle race, speedsters careen into a turn in Sweden, August 1973.Photograph by Albert Moldvay, National Geographic

Boys play hockey when temperatures sink below freezing in Minnesota, February 1976.Photograph by David Boyer, National Geographic

Boys play hockey when temperatures sink below freezing in Minnesota, February 1976.Photograph by David Boyer, National Geographic

Two balls dropped from the tower in Pisa replay Galileo’s experiment, November 1974.Photograph by Luis Marden, National Geographic

Two balls dropped from the tower in Pisa replay Galileo’s experiment, November 1974.Photograph by Luis Marden, National Geographic

The stone and concrete ampitheatre of the Colosseum in Rome, October 1979.Photograph by O. Louis Mazzatenta, National Geographic

The stone and concrete ampitheatre of the Colosseum in Rome, October 1979.Photograph by O. Louis Mazzatenta, National Geographic

A woman harvests vanda orchids from Hilo nursery fields in Hawaii, March 1975.Photograph by Robert Madden, National Geographic

A woman harvests vanda orchids from Hilo nursery fields in Hawaii, March 1975.
Photograph by Robert Madden, National Geographic

Men soak in mineral-laden hot waters of the Rudas Baths in Budapest, Hungary, April 1971.Photograph by Joe Scherschel, National Geographic

Men soak in mineral-laden hot waters of the Rudas Baths in Budapest, Hungary, April 1971.Photograph by Joe Scherschel, National Geographic

An aerial photograph of farmland in Michigan, June 1979.Photograph by James L. Amos, National Geographic

An aerial photograph of farmland in Michigan, June 1979.Photograph by James L. Amos, National Geographic

East German children nap in a collective day care so parents can work, September 1974.Photograph by Gordon Gahan, National Geographic

East German children nap in a collective day care so parents can work, September 1974.Photograph by Gordon Gahan, National Geographic

The Mississippi river meanders through a marsh in Minnesota en route to the gulf, June 1971.Photograph by James L. Stanfield, National Geographic

The Mississippi river meanders through a marsh in Minnesota en route to the gulf, June 1971.Photograph by James L. Stanfield, National Geographic

Elephants performing the long mount signal the end of the show, March 1972.Photograph by Jonathan Blair, National Geographic

Elephants performing the long mount signal the end of the show, March 1972.Photograph by Jonathan Blair, National Geographic

Aerial view of Balandra Beach in Baja California, Mexico, October 1972.Photograph by Michael E. Long, National Geographic

Aerial view of Balandra Beach in Baja California, Mexico, October 1972.Photograph by Michael E. Long, National Geographic

An old pearl diver in La Paz, Mexico, reminisces about an encounter with a shark, 1972.Photograph by Michael E. Long, National Geographic

An old pearl diver in La Paz, Mexico, reminisces about an encounter with a shark, 1972.Photograph by Michael E. Long, National Geographic