A historic landmark as well as a major government complex, Dublin Castle was built in the 13th century on the site of a Viking settlement (remnants of which can still be seen today). Until 1922, the castle was the British headquarters in Ireland. The structure is a Georgian palace with the requisite grand reception hall and palatial apartments, a Gothic Revival chapel, and several museums. Today it is used to inaugurate presidents and host state dinners, and it has been used to entertain everyone from Nelson Mandela to John F. Kennedy. In addition to the Chester Beatty, there is a second museum that houses paintings, sculpture, and textiles spanning ages.