This month marks the 50th anniversary of the Cuban Missile Crisis - a confrontation between the United States and the Soviet Union that brought the world to the brink of nuclear war.
The Cuban Missile Crisis

1
This file photo shows Cuban President Fidel Castro replying to U.S. President John F. Kennedy's naval blockade via Cuban radio and television on October 23, 1962.

2
This is a low level photograph released by the U.S. Defense Department made October 23, 1962 of the medium range ballistic missile site under construction in the San Cristobal area of Cuba.

3
In this October 25, 1962 file photo, U.S. Ambassador Adlai Stevenson, far right, describes aerial photographs of launching sites for intermediate range missiles in Cuba during an emergency session of the United Nations Security Council at U.N. Headquarter

4
This aerial reconnaissance photo is of the San Cristobal medium range ballistic missile site No. 3 in Cuba. The U.S. Department of Defense says, shows the site at its maximum readiness on October 27, 1962.