The Romanesque window found in its south facade is the best evidence that the St. Mark's Church must have been built as early as the 13th century as is also the semicircular ground-plan of St. Mary's chapel (later altered).
In the second half of the 14th century, the church was radically reconstructed. It was then turned into a late Gothic church of the three-nave type.
Massive round columns support heavy ribbed vaults cut in stone and an air of peace and sublimity characterizes the church interior in its simplicity. The most valuable part of St. Mark's Church is its south portal, considered to be the work of sculptors of the Parler family from Prague (end of the 14th century).
The Gothic composition of the portal consists of fifteen effigies placed in eleven shallow niches. On top are the statues of Joseph and Mary with the infant Jesus, and below them one can see St. Mark and the Lion; the Twelve Apostles are placed on both sides of the portal (four wooden statues replaced the original ones which had been destroyed). In its artistic composition and the number of statues, this portal is the richest and the most valuable Gothic portal in southern Central Europe.
Outside, on the northwest wall of the church lies the oldest coat of arms of Zagreb with the year 1499 engraved in it (the original is kept in the Zagreb City Museum).
On the roof, tiles are laid so that they represent the coat of arms of Zagreb (white castle on red background) and Triune Kingdom of Croatia, Slavonia and Dalmatia.
As the corner of St. Mark's Square and the present day Street of Ćiril and Metod, was a Town Hall, the seat of the city administration in medieval times. The building has gone through a number of alteration and reconstruction phases, and today this old Town Hall still keeps its doors open for the meetings of the Zagreb City Council.References:
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.