Ballinafad Castle is an Elizabethan blockhouse built during the Nine Years' War by Captain John St. Barbe on land granted to him by King James VI and I. The castle was garrisoned by ten men and commanded by John St. Barbe. It was partially destroyed by Red Hugh O’Donnel in 1595. The castle was again sacked in 1642 and fell out of use by 1680.
Today it is in ruins and is accessible year round. There are no tours, guides, or fees. Visitors can park in a small carpark at the foot of the hill where they will find an interpretive sign. Visitors cannot enter the castle, but the interior is visible through breaches in the walls that are closed off by iron fences.
References:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.