Built between 1622 and 1638, this fortress was, together with Mount Fortress, invaluable in fending off the attempted Dutch invasion of 1622.
Inside the fortress stands Guia Chapel, built around 1622, and Guia Lighthouse, dating from 1865, the first modern lighthouse on the Chinese coast. Macao takes its co-ordinates from the exact location of the lighthouse.
Guia Chapel was originally established by Clarist nuns, who resided at the site before establishing the Convent of St. Clare. In 1998 frescoes were uncovered inside Guia Chapel during routine conservation work. The chapel’s elaborate frescoes depict representations of both western and Chinese themes, displaying motifs of religious and mythological inspiration that are a perfect example of Macao’s multicultural dimension.
Guia Fortress, along with the chapel and lighthouse are symbols of Macao’s maritime, military and missionary past. - in: http://www.macauheritage.net/en/HeritageInfo/HeritageContent.aspx?t=M&hid=50