Dublin Castle is located in the city centre off Dame Street and is one of Dublin’s best known sights. Originally built in the 13th century on a site previously settled by the Vikings, it functioned as a military fortress, a prison, treasury, courts of law and the seat of English Administration in Ireland for 700 years. A tour of the castle gives you a feel for Ireland’s history. If you decide to visit the state apartments, you will be able to use your stroller however the Medieval Undercroft is only accessible by stairs. The Chester Beatty Library is housed within the castle which is described by the Lonely Planet as, “not just the best museum in Ireland, but one of the best in Europe”.It is an art museum and library which houses the great collection of manuscripts, miniature paintings, prints, drawings, rare books and some decorative arts from Europe, Asia, Africa and the Middle East which were assembled by Sir Alfred Chester Beatty (1875-1968). A baby carrier would be useful when visiting here Dublin Castle although you should be able to manage with a stroller if you have help with the steps located throughout. The Silk Road Cafe within the castle is also worth a visit for a refreshment after sightseeing and this is located at ground floor level.