Archaeological finds, discovered at Crossrail worksites across London, are going on show in a special exhibition.
Medieval human bones and a piece of mammoth jaw bone are among the items on display at the Crossrail Tottenham Court Road Visitor Information Centre.
Large-scale excavations are taking part in several places across the capital, as engineers prepare to bore tunnels under the River Thames for the Crossrail train project.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.