The recent surge in violence in Iraq has echoes of the sectarian conflict in 2006-07
BBC World Service Online
Novelist Colm Toibin recalls US President John F Kennedy's visit to Ireland in June 1963
It took until the 1950s for researchers to connect smoking with lung cancer
It is regarded as one of the most important pieces in 20th Century English music.
It's 55 years since a picture of a foetus inside the womb was first published.
It's 50 years since Soviet Cosmonaut Valentina Tereshkova went into orbit.
In June 1979 an American TV reporter was shot dead by government forces in Nicaragua
It is 40 years since the opening of a comedy musical which would become a cult phenomenon
It is 60 years since the American couple were executed for spying
The first gay marriage in America took place more than 40 years ago in Minnesota.
In 1971 one man leaked thousands of pages of secret US government documents to the press.
A child's eye view of life in Berlin in the aftermath of World War II
The election of Chief MKO Abiola 20 years ago, which was annulled by the military
In June 1962 three prisoners escaped from the maximum security US jail.
Britain's disturbing abuses against the Mau Mau in colonial Kenya
How huge crowds of Americans mourned Bobby Kennedy after his 1968 assassination.
Millions of people were sent to brutal labour camps in the USSR under Joseph Stalin
Twelve years ago, Timothy McVeigh was executed for carrying out the 1995 Oklahoma bombing
How a protest by black activists in 1963 led to the UK's first anti-racism laws
Twelve years ago, the Crown Prince of Nepal massacred his family at the royal palace