<prompt> Translate the following text to EnglishHata juu zaidi katika milima, Kastro ilijengwa ili kuepuka tahadhari ya maharamia, na bado inathibitisha kuwa vigumu kwa wote isipokuwa wageni walio na azimio zaidi.  <response>: Even higher up in the mountains, Kastro was built to evade the attention of marauding pirates, and still proves elusive to all but the most determined visitors. 