A look back at Alcatraz

From left to right are the laundry room, power plant and quartermaster building on Alcatraz Island, shown Oct. 20, 1933 in San Francisco. (AP Photo/Ernest King)

A look back at Alcatraz

This is Alcatraz Island prison, seen from the east, shown 1945. (AP Photo/Jack Rice)

A look back at Alcatraz

Jim Lowrie, a guard on Alcatraz's cell block, looks over the empty cell block after the last of the prisoners left the Rock for removal to other prisons, March 21, 1963 in San Francisco. (AP Photo)

A look back at Alcatraz

This is a gun tower on the west side of Alcatraz Prison Island in San Francisco Bay, shown April 30, 1952. The San Francisco skyline can be seen in the background. (AP Photo/Ernest K. Bennett)

George H. W. Bush

President George Bush greets South African leader Nelson Mandela on the South Lawn of the White House, Monday, June 26, 1990, Washington, DC. Mandela told Bush the support blacks in South Africa have received from the United States, particularly economic sanctions, have been crucial promotin…

George H. W. Bush

Pres. George H. W. Bush talks to reporters at the Oval Office of the White House during his first full day as president, Saturday, Jan. 21, 1989, Washington, D.C. (AP Photo/Doug Mills)

US, Mexico to sign landmark deal on sharing Colorado River water

The agreement will split surpluses and share the pain of shortfalls in the Colorado River's water, as seen at Horseshoe Bend, near Page.

US, Mexico to sign landmark deal on sharing Colorado River water

LAS VEGAS - Officials from the United States and Mexico have made a Tuesday date in San Diego to sign a landmark agreement to share Colorado River water during times of drought and surplus.

Images from past presidential debates

The caption for this says "Abraham Lincoln is shown at his debate with Stephen A. Douglas, speaking during his presidential campaign, 1860, in Illinois." However, it is more likely that this was during Lincoln's run against Douglas for Senate in 1858. Douglas won the Senate seat. Those debat…

Images from past presidential debates

President Gerald Ford, right, and Jimmy Carter shake hands before they started their debate at the Palace of Fine Arts Theater, Wednesday, Oct. 6, 1976, San Francisco, Calif. There were no presidential debates between 1960 and 1976. During one of these three debates Ford said, "There is no S…

A look back: Terrorist acts against Americans

A U.S. Marine sits on the bumper of a car that was destroyed when a huge bomb explosion wrecked the American Embassy in West Beirut, April 19, 1983, where he is on guard duty across the street from the Embassy. Rescue workers continued to search the rubble for those missing in Monday's explo…

A look back: Terrorist acts against Americans

Destroyed autos and debris still litter the B-2 level of New York's World Trade Center, March 7, 1993. Explosives experts used scaffolding to lower themselves into a giant bomb crater under the building, expanding their search for new clues after the shaken cellar was strengthened with steel…

A look back: Terrorist acts against Americans

Workers clear debris in an underground corridor in the World Trade Center in New York, March 1, 1993. At least five people were killed in the explosion that the FBI confirmed was caused by a bomb. (AP Photo/Alex Brandon)

Democratic National Conventions: A look back

Jimmy Carter tries to quiet the delegates in order to start his acceptance speech, July 16, 1976, in New York at the Democratic National Convention. (AP Photo)

Democratic National Conventions: A look back

Former Pres. Jimmy Carter, center right, and Rosalynn Carter, center left, wave from the podium during a visit to the site of Democratic National Convention at The Omni, Saturday, July 16, 1988, Atlanta, Ga. It was in 1976 that the Carters stood at the podium of the Democratic National Conve…

Democratic National Conventions: A look back

Jimmy Carter hugs his eight-year-old daughter, Amy, as he makes his way to the podium to begin his acceptance speech as the Democratic presidential candidatey, July 15, 1976 in New York. (AP Photo)

Democratic National Conventions: A look back

President Jimmy Carter applauds Sen. Edward M. Kennedy (D-Mass.) at the Democratic National Convention at New York's Madison Square Garden, Aug. 12, 1980. (AP Photo/Cameron Bloch)

Democratic National Conventions: A look back

Here is a characteristic pose of Sen. Alben Barkley, of Kentucky, who last night sounded a ringing praise for The New Deal and a scorching denunciation of Republican policies in his keynote address to the Democratic National Convention, June 24, 1936, Philadelphia, Pa. (AP Photo/GRS)

Democratic National Conventions: A look back

Sen. Alben Barkley, of Kentucky, right, waves to cheering delegates as he appears on speakers rostrum to deliver keynote address at the Democratic National Convention, July 12, 1948, Philadelphia, Pa. The man on the left is unidentified. (AP Photo)

Republican National Conventions: A look back

President George Bush gives the thumbs-up as he stands with his family on the podium at the Republican National Convention on Wednesday, Aug. 19, 1992 at the Houston Astrodome night. (AP Photo/Doug Mills)