Demo of UK schools data from data.gov.uk. Map markers show:
Red: schools open but due to close
Purple: schools closed between 1/1/2008 and 1/10/2009;
Green: schools opened between 1/1/2008 and 1/10/2009

For more information about the pipework behind, see: Getting Started with data.gov.uk, Triplr SPARYQL and Yahoo Pipes