The Catholic Church of the Conception of the Virgin Mary, which is in the style of a Greek temple with a Doric portico and cupola, was completed in 1821. The rank of cathedral was granted in the 12C to Christ Church, and it has been known as the Pro-Cathedral since the late 19C («pro» meaning provisional). Its choir, the Palestrina Choir, founded in 1902 by Edward Martyn, had John McCormack as one of its first members.

Today, Dalkey forms part of Dún Laoghaire. In the past, it had its own town wall and seven fortified buildings. Bulloch Castle, near the shore, was built in the 12C by the monks of St Mary's Abbey in Dublin in order to defend the port.

The sweet fragrance of hops will lure you into the old warehouse of the Guiness brewery, where a glass of the most famous creamy-headed stout in Ireland is given to visitors after they have visited the Guinness production exhibition (for which there is a charge, despite its promotional nature). A film, writings, paintings, and old equipment help recreate the 140-year existence of the family firm.

The tour starts with the passengers boarding a drakkar to explore Dyfflin, the old Viking Dublin. The inhabitants relate how they traded, settled in Dublin, working with leather and textiles and making jewellery before converting to Christianity and building the first church. A film traces the history of the Vikings as they journey as far as Russia and Istanbul, navigating by the sun and stars.