Events will be held accross the capital today to commemorative 70 years after the liberation of Auschwitz-Birkenau in Poand.
Senior politicians and other dignitaries will join survivors for an event at Westminster with another event taking place the Imperial War Museum.
The capital's museums and galleries had record-breaking visitor numbers this summer.
Many of the attractions had their highest-ever monthly total in August this year - despite the warm weather which would usually keep people away while they enjoy the sun.
The Imperial War Museum welcomed more than 250,000 visitors as it helped to mark the centenary of the First World War.
And the National Gallery saw 681,000 pass through its doors - more than 100,000 above last August's figure.
IWM will re-open its doors today following a temporary closure for 'transformation works'. The museum will now feature its First World War Galleries and impressive atrium space for the larger displays. Today's opening co-insides with the centenary of the First World War
Union leaders have warned against plans to privatise visitor services at the Imperial War Museum.
The Public and Commercial Services union said a decision is due this week on whether to press ahead with a multimillion-pound sell-off.
If a deal goes through, a new company would take over in April, just two months before the Lambeth-based war museum is due to open new galleries.The PCS said it feared handing visitor services and security to a profit-making company will lead to cuts in jobs and standards.
The heroes of Britain's armed forces were saluted at an awards ceremony at the Imperial War Museum last night.
The 'Millies', as they are known, recognise extraordinary people and their remarkable achievements.