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Línea Avanzada (Advanced Defense Line) de Puerta de Tierra

Línea Avanzada (Advanced Defense Line) de Puerta de Tierra - Credit: Wikimedia Commons

The Advanced Defense Line (Spanish: Línea Avanzada) is a historic district consisting of four structures that formed part of the eastern defensive system of the Islet of San Juan in San Juan, Puerto Rico. Read more on Wikipedia

• type: NRHP
• date from: 1750

Source: en.wikipedia.org