St Brendan's Cathedral

St Mary's Cathedral is the Catholic cathedral of Killarney. It was built between 1842 and 1855 and was designed by the famous English architect Augustus Welby Pugin. It is considered to be one of the most important 19th century Gothic Revival churches in Ireland. The tower and nave were designed by the Irish architects Ashlin and Coleman of Dublin. The interior decoration was designed by J.J. McCarthy.

Muckross Abbey, founded in 1448 as a monastery for the Franciscan friars, is today in a state of ruin. Looted several times in its history, the monastery was finally burnt down by Oliver Cromwell's troops in 1652. Today, the abbey, although it has no roof on most of it, is relatively well preserved. One of its curiosities is its vaulted cloister, in the Norman Romano-Gothic style, organised around an inner courtyard which houses a large yew tree several hundred years old, as in the abbey of Jumièges.

The Cathedral of Saints Peter and Paul was built between 1828 and 1861, designed by the architect Dominic Madden. Construction of the church was largely halted during the Great Famine. The church tower was completed in 1874. The parish church was elevated to pro-cathedral status in 1889, and to cathedral status in 1990.