St Canice’s Cathedral was built between 1202 and 1285 and is the second-longest in Ireland after St Patrick’s Cathedral in Dublin. The Round Tower stands 100-feet tall and is the oldest standing structure in Kilkenny City. It is also only one of two Round Towers that the public can climb in Ireland. This early monastic site was founded by St Canice sometime in the 6th century AD. Most of the Cathedral is preserved in its original medieval style and includes stained-glass windows, a choir stall with decorated carvings, and also a floor that is paved with four different types of marble from each of the four provinces of Ireland.