Isla de Mona Light, Mona Island, Cabo Rojo, Cabo Rojo Municipio, PR
Significance: Mona Island Light is the only existing lighthouse for which two entirely different plans were drawn between 1885-1886. The first plan called for a 2nd class light, 22 miles range light beam, 3 keepers, and a structure (37.7 x 24 mts) with 25 rooms. It was to be built around a central courtyard. The octagonal tower (5.5 mts. in diameter) was 16 mts. high excluding the 7 mt. high lantern. The walls generally measured 1 mt. thick. According to the evidence this massive structure was under study in 1885 to be located at the present site.
Survey number: HAER PR-24
Building/structure dates: 1888-1894 Initial Construction
Building/structure dates: 1938 Subsequent Work
Building/structure dates: 1973 Subsequent Work
Building/structure dates: 1976 Subsequent Work