The prize pieces of this stunning collection include Piero della Francesca 's San Nicola da Tolentino , Mantegna 's Madonna and Child , a Botticelli Madonna , and Antonio Pollaiuolo 's lovely Portrait of a Young Woman .
Piero della Francesca 's San Nicola da Tolentino , Mantegna 's Madonna and Child , a Botticelli Madonna , and Antonio Pollaiuolo 's Portrait of a Young Woman are the most popular and valuable pieces in this collection .