Religious architecture includes extant cathedrals as well as the ruins of monasteries and abbeys. Numerous convents, abbeys, and other religious institutions were built. In ruins were castles, palaces, churches, abbeys, towns and villages. Some of these are religious institutions such as abbeys and monasteries. There are numerous abbeys and priories in Clare. Others, such as Westminster Abbey, are former abbeys and cathedrals. In the centuries following the Conquest splendid abbeys and priories were built in Yorkshire. The major architectural undertakings were the buildings of abbeys and cathedrals. The new owners turned monks out of their monasteries and abbeys. In the centuries following, many abbeys and priories were built in Yorkshire. Notably, the Cistercians had one which connected more than 6,000 abbeys, monasteries, and churches. The earliest Gothic art was monumental sculpture, on the walls of Cathedrals and abbeys. Others were educated in schools attached to the parishes, cathedrals or abbeys. Abbeys and castles were also attacked and destroyed. Klosterneuburg Abbey, located here, is one of the oldest abbeys in Austria.