Schloss Thorn is a former castle, that has been turned into a stately home. The history of the castle dates from the ancient times. Due to the existence of a ford here, the Romans built a guard tower on a protruding rock here to protect and observe the crossing. This tower would give the later medieval castle its name, the Latin 'turris' meaning 'tower'.
Schloss Thorn was built on the ruins of the probably rectangular, medieval castle guarded by round corner towers. Until the 16th century it was a fief of the lords of Rollingen (hereditary marshals of Luxembourg) to the lords of Bübingen. Then it passed to the ownership of the lords of Musiel, where it remained until the end of the 19th century. It had become decrepit by the end of the 15th century, and was rebuilt in 1536 by the new owner apart from two towers and a part of the defensive wall. In 1800, it was rebuilt by the owning family into more of a stately home and the old defensive buildings were turned into garden terraces.
One of the two towers left after the 16th century renovations, the round tower at the south-eastern corner was destroyed by bombardment in 1945. The second, a rectangular tower that used to be inhabitable, is now a gate tower.
Due to the rebuilding and renovation work carried over hundreds of years, the castle now shows characteristics of the architectural styles of the Middle Ages, through to the Renaissance, Baroque and Empire styles.
Schloss Thorn is still in use as a residence today, owned by the Barons von Hobe-Gelting. The wine is produced from the surrounding vineyards, which have been family-owned since 1534. It is the oldest castle vineyard on the Moselle and also has the only preserved tree wine press of Europe.
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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.