It was an uncovered fort with a manposteria (coral stone and lime mortar) parapet, rising about 10 feet (3.0 m) above a sloping hillside.

It is listed on the U.S. National Register of Historic Places, as the only remaining fortification of the Spanish Era in Hagåtña.

It was used by Americans as a signal station until 1933, and was converted to a gun emplacement by the Japanese occupiers during World War II.

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