Línea Avanzada
Línea Avanzada (Advanced Defense Line) de Puerta de Tierra | |
| Location | Puerta de Tierra, San Juan, Puerto Rico |
|---|---|
| Coordinates | 18°27′46″N 66°05′03″W / 18.462841°N 66.084199°W |
| Built | 1750–1799 |
| Architect | multiple |
| NRHP reference No. | 97001136 |
| RNSZH No. | 2000-(RMSJ)-00-JP-SH |
| Significant dates | |
| Added to NRHP | September 25, 1997 |
| Designated RNSZH | February 3, 2000 |
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.