ENA significant source for the discussion on the subject is the nobles’ diaries written on their tours of foreign countries. A practical application of their art theories is noticed. Through the notes of the nobles their interests and evaluations are presented. The diaries of Teodoras Bilevičius’ trip to Europe in 1677-978; of Karolis Stanislovas Radvila’s (1669-1719) in 1684-1687 as well as of Kristupas Zaviša’s (1666-1721) trip to Rome in 1700-1701 are under study. Art perception of the nobles of that period was very traditional. A wide range of their interests can be noted: Nature and antique architecture; Gothic, renaissance and baroque churches; palaces, castles, bridges, parks and fountains; fine and applied arts; technical inventions; relics and sacred places. The Lithuanian nobles of the second half of the 17lh century did not show much interest in music, theatre and ballet. They were lost in admiration of large, luxurious palaces, churches, parks and fountains. Art objects of Italy, Austria and Germany were of great interest to them. Rare materials, large buildings and art works were especially admired by them. The period discussed is providing for new terms concerning the nobles’ field of evaluations. They are: delicacy, form, naturalistic art and bright colours. The perception of art of the nobles was characteristic of baroque.