<prompt> Translate the following text to EnglishSehemu ya kale zaidi ya jumba hilo la kifalme, Mnara wa James wa Tano ambayo wakati mmoja uliitwa Mnara Mkubwa, ni sehemu muhimu ya ziara hiyo.  <response>: The oldest part of the palace, the James V Tower once called the Great Tower, is for many the highlight of the tour. 