Times Past appears in every issue of The New York Times Upfront. Here's a selection from our archive. Look for additional Times Past features here in the months ahead.

U.S. HISTORY

1911: Triangle Shirtwaist Fire (March 14, 2011)

1971: The Pentagon Papers (February 21, 2011)

1961: The Freedom Riders (January 10, 2011)

1970: Planet Earth Takes Center Stage (September 20, 2010)

1945: The Birth of the U.N. (September 20, 2010)

1920: Women Get the Vote (September 6, 2010)

McCarthyism: A Decade of Fear (March 15, 2010)

Mark Twain's Bad Boy (March 1, 2010)

The U.S. & Afghanistan (February 8, 2010)

1960: Greensboro Sit-Ins (January 18, 2010)

Hooked on Oil (November 23, 2009)

1929: From Boom to Bust (September 21, 2009)

1939: Marian Anderson (April 20, 2009)

1979: Three Mile Island (March 16, 2009)

1960: The First Mass Media Election (October 6, 2008)

1957: The Integration of Central High (September 3, 2007)

1947: Jackie Robinson Integrates Baseball (April 2, 2007)

WORLD HISTORY

1991: Apartheid Ends (April 4, 2011, 2011)

1961: The Bay of Pigs Invasion (January 31, 2011)

1991: The War Before the War (December 13, 2010)

Over A Barrel (October 4, 2010)

From One Korea to Two (May 10, 2010)

1960: Africa's Year of Freedom (April 19, 2010)

1975: The Fall of Saigon (April 5, 2010)

1919: The 'End' of WW I (May 4, 2009)

1979: Iranian Revolution (April 6, 2009)

1959: The Cuban Revolution (September 1, 2008)

2008: Nelson Mandela at 90—A Look at an Extraordinary Life (May 5, 2008)

1948: The Birth of Israel (April 14, 2008)

1933: Hitler Comes to Power (March 10, 2008)

1967: The Six-Day War (April 16, 2007)

1979: Iran's Islamic Revolution (September 18, 2006)