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19th-century medicines on display

Asian immigrant undergoes tests at Angel Island in California

Asian immigrants arrive at Angel Island in California

Angel Island immigration officials disinfect clothing of immigrants

Theodore Dreiser

Schematic of the Castillo de San Marcos, St. Augustine, Florida

Moat view of the Castillo de San Marcos, St. Augustine, Florida

Aerial view of the Castillo de San Marcos, St. Augustine, Florida

18th-century plan showing Castillo de San Marcos, St. Augustine, Florida

Chart of the Gulf Stream by James Poupard and Benjamin Franklin

Chart of the Gulf Stream annotated by Benjamin Franklin

Franklin-Folger chart of the Gulf Stream

Benjamin Franklin map of Gulf Stream

Juan Ponce de Leon and his men seek Fountain of Youth

Juan Ponce de Leon

Building of St. Augustine, Florida in 1565

Japanese painting of samurai with a woman

Blast of fission-based nuclear weapon test on November 15, 1952

Blast from test of fission-based nuclear weapon, November 15, 1952

Crater made by test of first atomic bomb, Trinity in 1945

Fireball from atomic device Trinity in 1945

Fireball from first atomic bomb, Trinity in 1945

Detonation of first atomic bomb, Trinity in 1945

Personnel observe blast from Buster-Jangle atomic tests in 1951

Mushroom cloud from test of first hydrogen bomb

Mushroom cloud from test of first hydrogen bomb

Mushroom cloud from test of first hydrogen bomb

Mushroom cloud from test of first hydrogen bomb

Mushroom cloud from test of first hydrogen bomb

CDC staffer examines specimens of 1918 influenza virus

Western cottonmouth snake

CDC staffer inoculates chicken eggs with influenza virus in 1968

Mother applies mosquito repellent to child

Workers during 1920s dig mosquito-control ditch