The wall

'Israel and the Arabs: Elusive Peace' Part 3 on BBC TV. It was the frustration of some militants when Israel went ahead with the building of the wall on Palestinian land at top speed that led to the initial breach in the ceasefire (hudna) in August 2003. This resulted in the resignation of Mahmoud Abbas (Abu Mazen) as Prime Minister and a renewed cycle of retaliation and further suicide bombings.

(This post from Chris Bertram has comments on whether it was or not the same version shown on PBS in America.)
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Regarding that other wall, the BBC finally realise it has come down; they are scrapping foreign language services in former communist countries, to pay for an Arabic TV service. Not too sure about the Kazakh service, though.