The Ibrahim Pasha Mosque in Razgrad is the third-largest mosque on the Balkan Peninsula and the second-largest in Bulgaria. It is one of the most exquisite examples of Ottoman classical architecture.
The Mosque was a mosque built by Ibrahim Pasha of Parga in Razgrad in 1533. Though left unfinished, the mosque was functional until 1600, but due to an unknown reason between the years of 1600–1610 it was demolished. Is that it might have been destroyed by an earthquake. However, the question why the first mosque was torn down is still open. The construction of the new mosque was finished in 1616–1617. This is evident from the marble sign, where the year of construction is engraved as 1025 by the Hijri calendar.
The mosque is a single-domed building, made entirely of stone, built on a square base. The mosque is built of limestone blocks of light-yellow colour and grainy structure. The blocks are of homogeneous material, making it unlikely that the blocks were taken from the old mosque or the Roman town of Abritus. All stones are perfectly polished and built in rows with a thin joint. Some of them are attached with iron clamps and soldered with lead – a preventive measure, used by the Ottomans to protect minarets during earthquakes. (It is believed that this feature of the mosque is the reason it withstood the 9 earthquakes in Romania between 1701 and 1997.) In addition, the masons reinforced the mortar by putting egg whites in it. All façades end in height with a common narrow and elegant classical cornice. Three of them (except for the north-western façade) are based on a stone plinth. There are 45 windows on the four façades – on three of them there are 13 windows, and on the front façade, there are 6.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.