Fort Santa Agueda, also known as Fort Apugan, sits atop the Agana Heights area and has a wonderful view of central Guam. It was originally a Spanish fort that was built in order to protect the capital village of Agana. It also served as an ideal location for observing the horizon for potential threats to Spanish interests on Guam, much of which revolved around the lucrative Acapulco-Manila galleon trade system that saw gold and silver from South America being traded with Chinese merchants in the Philippines for many exotic treasures from the Orient