Dublin Castle is not what many tourists expect and below is an example of a not untypical review:
"Not a castle at all. Basically a government building that they hang artwork in and not good artwork." This reaction is not at all surprising.
If you you intend to visit Dublin Castle you need to be aware that it is a working castle and that it has been modified many times over an extended period and that it was never intended that its main function is to operate as a tourist attraction. If you are unimpressed by the castle then it might be a good idea to visit the Chester Beatty [there is no entry fee].
The Chester Beatty is a museum and library. Formerly known as the Chester Beatty Library, it was established in Ireland in 1950, to house the collections of mining magnate, Sir Alfred Chester Beatty. The present museum, on the grounds of Dublin Castle, opened on 7 February 2000, the 125th anniversary of Beatty's birth and was named European Museum of the Year in 2002.
The museum's collections are displayed in two galleries: "Sacred Traditions" and "Artistic Traditions". Both displays exhibit manuscripts, miniature paintings, prints, drawings, rare books and some decorative arts from the Persian, Islamic, East Asian and Western Collections. The Chester Beatty is one of the premier sources for scholarship in both the Old and New Testaments and is home to one of the most significant collections of Islamic and Far Eastern artefacts.