If you walk just a few steps west. along the left side of the fork, immediately after you pass “La Casa Rosada” you will see a couple of tennis courts on your right and a large green plot of land on the left with a huge tree in the center. In colonial times this used to be the San Agustín Bastion.
Bastions were semi polygonal projecting structures equipped with heavy artillery that were erected at frequent intervals and designed to take advantage of the local topography. Rounded sentry boxes at various corners served as observation posts to guard the city wall.
This is another excellent vantage point to make beautiful photos of the San Juan Gate and Santa Catalina Palace area.