 It is classified as a property of public interest () under the regional legislation on patrimony and culture, 13/84/A (31 March 1984) and under paragraph 4, of article 58, of the Regional Decree 29/2004/A (24 August 1984).Erected on the eastern flank of the Monte da Guia, in a dominant position over the Bay of Horta, and integrated into the medieval defensive system against pirates in the channel.It was built from masonry stone and volcanic rock