Castillo San Miguel de Agüi

The Castillo San Miguel de Agüi is a Spanish colonial fortress on the Lacuy Peninsula that overlooks the Chacao Channel from an elevated position. The site features stone walls and cannon batteries arranged to defend against approaching vessels.

The fortress was built in 1779 as a strategic outpost to guard against piracy and foreign attack along the Chilean coast. It maintained defensive importance until the early 1800s, when its military role gradually diminished.

The fortress displays the military architecture that Spain built along this coast during colonial times, using local stone and defensive layouts. Visitors can observe how Spanish forces organized their coastal settlements and protected their territorial interests.

The site sits on the Lacuy Peninsula and requires traveling by vehicle from Ancud along rural roads. A museum on-site displays objects and information from the colonial era.

The fortress's original entrance gate retains its Spanish design and represents one of the few preserved examples of this type in the Americas. This gate reveals how colonial military construction standards were applied.