San Cristobal Fort
Finished in 1783, Fort San Cristóbal stands as the largest fortification built in the New World by the Spanish. It originally encompassed 27 acres, encircling the city and walling it off from intruders approaching by land. If you are interested in history, enjoy a walk on the ramparts, where half a millennium ago Spanish soldiers held their watch. A labyrinth of tunnels crisscrosses deep underground where the dungeons are located, and the outside walls fall 150 feet straight onto the rocks of the north shore. If you love to photograph spectacular views, this fort is a goldmine for you, with its panoramic view of the coast from Old San Juan to Condado area and beyond.