Cardiff came ahead of Bern in Switzerland, Manama in Bahrain and Blantyre in Malawi.
BBC: NEWS | UK | Wales | South East Wales | City's slow pace of life revealed
Mr Rajab was arrested on 5 May at Manama airport on his return from the Lebanese capital, Beirut.
Mr Mushaima was hit at close range by birdshot in the Sanabis district of the capital city Manama.
The Formula One teams and drivers have slunk into Manama with little fanfare.
The trial has begun in Bahrain's capital, Manama, of five police officers implicated in the death in custody of a blogger last year.
She will also travel to the Middle East to deliver a speech on the role of the United States in regional security at the Manama Dialogue in Bahrain.
But in Bahrain police are still engaged in near-daily fights with protesters, mainly in the rundown Shia villages that surround the wealthy commercial hub of Manama, the capital.
"This verdict is final, there are no more appeals possible, it is the last stage of litigation, " defence lawyer Mohammed al-Jishi told Reuters news agency by telephone from Manama.
The Gulf island kingdom has been wracked by nearly two years of violence that followed the clearing of an iconic landmark, Pearl Roundabout, in the capital Manama, in February 2011.
MANAMA, Bahrain (CNN) -- British Foreign Secretary Jack Straw called on Syria Monday to assure the international community it has severed ties with Iraq's former regime and does not possess illegal chemical weapons.
The spokesman said although there had been continuing problems in Bahrain over the past 12 months, the riots in the main city of Manama were smaller than those which took place in Britain's capital London last August.
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