Dear goodlucy, thank you very much for your message. There is no admission fee or booking required for the Chester Beatty Library. We look forward to seeing you in the museum and we hope that you enjoy your visit. Here is some information about Dublin Castle which I hope you will find helpful: The State Apartments dominate the south range of the Great Courtyard. They were built as the residential and public quarters of the Viceregal Court and were the seat of the executive and focus of fashionable and extravagant social life. Today the Apartments are the venue for Ireland's Presidencies of the European Union, Presidential inaugurations and prestigious functions. The Undercroft is sited at lower ground floor level in the Lower Castle Yard, opposite the Chapel Royal. The city walls join the Castle at this point. Here, the archway allowed small feeder boats to land provisions at the postern gate, from larger boats moored on the Liffey. The double archway and postern gate are still visible. Also on view here is the Viking defence bank, within the butt of the Norman Powder Tower. The original Tower was five stories high - the top storey being occupied by the Lord Deputy during the 16th century. Tours of the State Apartments, Medieval Undercroft and Chapel Royal Monday – Saturday, 10.00 – 16.45 Sunday and Public Holidays, 12.00 – 16.45 Closed: Good Friday, 24th - 28th December & 1st January Tel: +353 1 645 8813, Fax: +353 1 679 7831 Access to the Medieval Undercroft and Chapel Royal is by guided tour only The State Apartments are wheelchair accessible, however, the Medieval Undercroft is only accessible by stairs Groups of 10 or more must be booked in advance Foreign language tours may be available on request Information leaflets are available in the following languages: English, Irish, French, German, Spanish, Italian, Polish, Greek, Chinese and Japanese Guided Tour Prices (50 minutes duration): Adults: €8.50 Students (valid ID required)/Seniors: €6.50 Children: 12 and under: €3.00, 6 and under: Free Group rate available on request Self Guiding Prices Adults: €6.50 Students (valid ID required)/Seniors: €5.50 Children: 12 and under: €3.00, 6 and under: Free All good wishes. Mary