La Fondation Calvet is an art foundation in Avignon, named for Esprit Calvet, who left his collections and library to it in 1810. The foundation maintains several museums and a two libraries, with support from the town. The original legacies of paintings, archaeological items, coins and medals, and medieval sculpture have been added to by many other legacies, and a significant deposit of works of art from the Louvre. The archaeological collections and medieval sculpture are now housed separately in the 'Musée Lapidaire' - once the chapel of the Jesuit College. The main museum is in an 18th-century city mansion, to which modern buildings have been added; the Library bequeathed by Calvet, and the important collection of over 12,000 coins and medals, have moved to a different location in the city.
In Avignon there are six museums:
The Kalozha church of Saints Boris and Gleb is the oldest extant structure in Hrodna. It is the only surviving monument of ancient Black Ruthenian architecture, distinguished from other Orthodox churches by prolific use of polychrome faceted stones of blue, green or red tint which could be arranged to form crosses or other figures on the wall.
The church is a cross-domed building supported by six circular pillars. The outside is articulated with projecting pilasters, which have rounded corners, as does the building itself. The ante-nave contains the choir loft, accessed by a narrow gradatory in the western wall. Two other stairs were discovered in the walls of the side apses; their purpose is not clear. The floor is lined with ceramic tiles forming decorative patterns. The interior was lined with innumerable built-in pitchers, which usually serve in Eastern Orthodox churches as resonators but in this case were scored to produce decorative effects. For this reason, the central nave has never been painted.
The church was built before 1183 and survived intact, depicted in the 1840s by Michał Kulesza, until 1853, when the south wall collapsed, due to its perilous location on the high bank of the Neman. During restoration works, some fragments of 12th-century frescoes were discovered in the apses. Remains of four other churches in the same style, decorated with pitchers and coloured stones instead of frescoes, were discovered in Hrodna and Vaŭkavysk. They all date back to the turn of the 13th century, as do remains of the first stone palace in the Old Hrodna Castle.
In 2004, the church was included in the Tentative List of UNESCO"s World Heritage Sites.