Baluarte Watch Tower is located in Luna, La Union, Philippines.

The mighty Baluarte was used as watch tower and observation post by the authorities for impending danger from the sea. Not from typhoons or tsunamis, but from the Abu Sayafs at that time: the Japanese, Chinese and Moro pirates who took pleasure in raping coastal towns and settlements. Because of its massiveness and height, the Guardia Civils are able to warn the residents of Namacpacan (the original name of the town of Luna) and prepare the peace officers to defend the properties and lives of their constituents. Like a guardian looking over its subjects, this ancient structure had served well its very purpose for countless times in the past.

Source:

Launion.gov.ph