Fort Kosmač was the southernmost fortress in the Austro-Hungarian Empire, guarding the southern extremity of the border between the empire and Montenegro. It is situated near Brajići village, on a hilltop overlooking the road between Budva on the coast and Cetinje, the Montenegrin capital at the time. Constructed in the 1840s, it was attacked during an 1869 rebellion and was garrisoned by Austrian troops until the fall of the empire in 1918. After passing to the newly established Yugoslavia, it was garrisoned again by Italian troops for a period in the Second World War.
The fort is now in a ruinous condition; it once had three storeys, but the topmost storey has collapsed entirely, leaving it roofless. The interior walls, floors and central staircase have also collapsed. Although the remains of the main staircase are still visible, the steps have disappeared entirely and the upper level cannot be reached, though there is nothing left of the upper floor to stand on in any case.
The interior of the fort is strewn with large quantities of fallen masonry, completely obscuring the original floor level. The extent of the collapse is so complete that it is no longer known how the interior was originally laid out. There are substantial holes in the interior's vaulted ceiling. The exterior has been subjected to some stone-robbing in pursuit of the finely-worked square blocks of grey limestone that were used to line the fort's outer walls.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.