The National Gallery started out quite small. In 1824, the British government purchased a collection of 38 pictures from a wealthy banker and put them on display in his townhouse, but it didn't take long for private donations to come trickling in. The early directors dreamed of something bigger, and a larger site was soon needed to house everything the gallery would contain. Today, the collection is kept in an impressive pantheon-style building raised on a terrace atop Trafalgar Square, with its round fountains and double-decker buses flowing by below. More than 2,300 masterworks have found their home behind the columns of the National Gallery, dating from the Middle Ages through the 20th century and including pieces from big names such as Monet, van Gogh, da Vinci, Holbein, Michelangelo, Rembrandt, Ruben and van Eyck.