Ellie Cawthorne on a protest at Essex University in 1968 that had a lasting impact.
Neil MacGregor considers the state of human rights - with a David Hockney print.
Michael Portillo explores the possibilities for peace and protest during World War I.
Historian and writer Dominic Sandbrook looks beyond the flower power, 50 years on.
The Woodstock music festival has come to symbolise much of the idealism of the 1960s.