Between 1612 and 1615, Salzburg’s prince-archbishop Markus Sittikus commissioned the building of a summer residence at the foot of Hellbrunn mountain, a location already abundant in naturally flowing waters. Based on Italian models and in a relatively short period of time, an architectural jewel had been created, still reckoned amongst the most magnificent Renaissance buildings north of the Alps. Hellbrunn was only meant for use as a day residence in summer, as the Archbishop usually returned to Salzburg in the evening, therefore, there is no bedroom in Hellbrunn.
The schloss is also famous for its jeux d'eau ('watergames') in the grounds, which are a popular tourist attraction in the summer months. These games were conceived by Markus Sittikus, a man with a keen sense of humour, as a series of practical jokes to be performed on guests. Notable features include stone seats around a stone dining table through which a water conduit sprays water into the seat of the guests when the mechanism is activated, and hidden fountains that surprise and spray guests while they take part on the tour. Other features are a mechanical, water-operated and music-playing theatre built in 1750 including some 200 automata showing various professions at work, a grotto and a crown being pushed up and down by a jet of water, symbolising the rise and fall of power. At all of these games there is always a spot which is never wet: that where the Archbishop stood or sat, to which there is no water conduit and which is today occupied by the tour guide.
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.