Here is where you will find web sites which carry information about London's art galleries, including both contemporary and traditional art works in a variety of formats including painting and photography.
 
 
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The world’s first purpose-built public art gallery was established in 1811 when Sir Francis Bourgeois left his collection of the old masters “for the inspection of the public.” Today, the gallery houses some of the United Kingdom’s leading exhibitions. The site contains in-depth sections about the collection, history, architecture, exhibitions archive, and news of the gallery as well as an online shopping section.
https://www.dulwichpicturegallery.org.uk
Located in Trafalgar Square, the National Gallery maintains this website that offers details about the gallery and its upcoming events, exhibitions and stories about them, and the latest arrivals. Additionally, the site shares the picture of the month, information about the artists, and a membership section which details the benefits and costs of becoming a member.
https://www.nationalgallery.org.uk
The world-famous National Portrait Gallery houses the most extensive collection of portraits in the entire world, and users can use the site’s search tool to delve into more than 215,000 pieces housed here. There are plentiful online exhibitions and tours, and a signup option for those who wish to receive email updates from the Gallery.
https://www.npg.org.uk
Presents contemporary art exhibitions which showcase the work of emerging artists. Since 2019, it has been a registered charity which provides a platform for contemporary art and culture and which supports artists and making their art accessible to everyone. There is a display of upcoming exhibitions and artists as well as past exhibitions and a search tool which can be used to find specific artists and works.
https://saatchigallery.com/