NATIONAL PORTRAIT GALLERY (The)
The National Portrait Gallery was founded in 1856 to collect portraits of famous British people. Its collection includes over 200,000 portraits from the 16th Century to the present day in a wide variety of different mediums. These include drawings, miniatures, negatives, paintings, photographs, prints, sculptures and many more.
'NPG' can get very crowded - but it's fascinating. You'll find it on the north of Trafalgar Square, next to the National Gallery.
Entry is free - this is a national collection.