Guánica Light was a historic lighthouse located in the municipality of Guánica, Puerto Rico in the Guánica State Forest. It was first lit in 1893 and deactivated in 1950. The light marked the entrance to Guánica Bay and bridge the gap between Los Morrillos Light and Caja de Muertos Light.
On July 25, 1898, lighthouse keeper Robustiano Rivera spotted the convoy of the American forces that initiated the landing offensive of the Puerto Rican Campaign during the Spanish–American War. He immediately gave the alert to the residents of Guánica and marched to Yauco where he broke the news of the invading forces to the city's mayor.
Wikipedia https://en.wikipedia.org/wiki/Guánica_Light
Address PR-333, 00653, United States
Coordinates 17°57'3.257" N -66°54'11.359" E