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Polvorín de Miraflores
Polvorin de Miraflores AC.JPG
Location San Juan, Puerto Rico
Built late 18th Century
NRHP reference No. 84003172
Added to NRHP March 9, 1984

The Polvorín de Miraflores is an 18th-century structure in San Juan, Puerto Rico, specifically in the island of Miraflores, that served as an ammunition storage place for the Spanish military. The site was included in the National Register of Historic Places in 1984 for its historic importance.


Polvorin de Miraflores, San Juan, Puerto Rico
Front facade of Polvorin de Miraflores

The Polvorín was built on orders of Field Marshal Alejandro O'Reilly, who visited the island in 1765 to gauge the status of the island defenses on a request of King Charles III. Among O'Reilly's recommendations was the construction of five ammunition storage (or polvorín) to support the other artillery structures on the island. Some accounts state the specific construction date as 1770 and others as 1776.

When the Spanish–American War ended in 1898, United States took control of the island. From that time until the 1930s, the Polvorín de Miraflores was used as a quarantine station under the administration of the United States Public Health Service. Ship passengers and immigrants were inspected here and, if necessary, were isolated from the population.

Since the 1940s, the building was repurposed as a chapel for the Isla Grande Naval Base. As a result, some changes were made to the structure, like the replacement of the chimney with a bell tower. The structure was then renamed Santa Bárbara Chapel.

When the Naval Base closed in 1971, the structure was handed to the Institute of Puerto Rican Culture. During this time, it was used as the setting for the San Juan Ballets and the San Juan Choir. Since 1984, it became part of the National Register of Historic Places.

Eventually, the building was taken by the Puerto Rico Department of Transportation and Public Works and the property was used for the storage of vehicles. With time, the property became abandoned and deteriorated. Recently, the structure was handed to the Convention Center District which prompted the removal of the abandoned vehicles from the property.

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