National Gallery: Trafalgar Sq,London, WC2N 5DN, United Kingdom, 020 7747 2885, Excellent collections, superbly arranged, easy to navigate. http://www.nationalgallery.org.uk
Tate National Portrait Gallery: This is a family of four art galleries housing the UK's collection of British art from 1500 and of international modern art. http://www.tate.org.uk
Hayward Gallery: The Hayward in London is a nationally regarded contemporary art gallery providing a range of visitor opportunities for viewing current art. http://www.haywardgallery.org.uk
Wallace Collection: The Wallace Collection is home to one of Europe's finest collections of works of art, paintings, furniture, arms & armour and porcelain.
http://www.wallacecollection.org
Guildhall Art Gallery: Many famous and much-loved pictures are once again on view for the public to see and enjoy in the new Guildhall Art Gallery that opened in 1999.
http://www.cityoflondon.gov.uk
Institute of Contemporary Arts: A London arts centre presenting contemporary film, exhibitions, talks, club nights, music, dance, and new media events. Also has a bookshop.
http://www.ica.org.uk