Marchers cross the Edmund Pettus Bridge on March 8, 2015, in Selma, Ala.This weekend marks the 50th anniversary of "Bloody Sunday,' when civil rights marchers were beaten, trampled and tear-gassed by police at the Edmund Pettus Bridge.
Crowds pass over the bridge on March 8.
Mercedes Binns been to Selma 17 times because of the civil rights history.
Moises Mason sits on his father Jeff's shoulders as their family walks along the Edmund Pettus Bridge before the beginning of the 50th anniversary of the Selma to Montgomery civil rights march on March 8.
President Barack Obama, first lady Michelle Obama, former President George W. Bush, former first lady Laura Bush and Rep. John Lewis, D-Ga., third from left, lead a walk across the Edmund Pettus Bridge on March 7. President Obama rallied a new generation of Americans to the spirit of the civil rights struggle, warning their march for freedom "is not yet finished."
President Obama hugs Rep. John Lewis, D-Ga., one of the original marchers, on March 7.
John Lewis, chairman of the Student Nonviolent Coordinating Committee, foreground, is beaten by state troopers as they break up a civil rights voting march in Selma, Ala., on March 7, 1965.
As several hundred marchers crossed the Edmund Pettus Bridge to begin a protest march to Montgomery, state troopers assaulted the crowd with clubs and whips.
The sun sets over the Edmund Pettus Bridge on March. 6.