Portora Castle was built for Sir William Cole who purchased the land in 1612. It is strategically positioned by the narrow exit of the River Erne into the Lower Lough Erne.
Sir Michael Cole and his family moved to Portora Castle in 1710 when their previous residence, Enniskillen Castle, was hit by fire. They remained there until about 1716, when Sir Michael's son, John Cole (1680–1726), started building Florence Court.
Three of the flankers remain, the two on the west, flanking the walls of the castle. These round towers, about 3m in diameter, have several gun loops. Inside the castle can be seen proper fireplace chimneys in the north and west walls.
The ford at Portora was important in the Erne Waterways and must have seen considerable traffic in peace and war. In the course of the Erne Drainage Scheme (1951–1960) a bronze dirk and stone axes were recovered at this point. The castle is now in ruins, partly because a group of truanting school-boys from nearby Portora Royal School, now Enniskillen Royal Grammar School, experimenting with gunpowder they learnt how to create in chemistry class, blew up a section in the latter part of the 19th century. They also tried digging under the building which added to its dereliction.
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.