El Yunque National Forest is a forest reserve located in northeastern Puerto Rico on the slopes of the Sierra de Luquillo mountains. It is the only tropical rainforest in the U.S. National Forest System. High annual rainfall creates a jungle-like setting with lush foliage, crags, waterfalls, and rivers.
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The Guánica Biosphere Reserve in southwestern Puerto Rico comprises coastal areas with mangrove cays and subtropical dry forests. Designated Guánica State Forest in 1919, it is considered the best-preserved subtropical forest and the best example of a dry forest in the Caribbean.
The Spanish system of fortifications in San Juan, Puerto Rico, is the oldest European construction in the United States and one of the oldest in the New World. These fortifications guarded the entrance to San Juan Bay and protected Spanish commerce in the Caribbean basin.
The Old San Jan Historic District is a National Historic Landmark District listed on the National Register of Historic Places. Old San Juan is the oldest settlement in Puerto Rico and the historic colonial section of San Juan.