El Morro, which sits within the San Juan National Historic Site, juts out of San Juan harbor and beckons to cruise ships. Construction of the hulking, six-story fortress started in 1539.

A No a Esencia poster in front of a mural of La Fortaleza and El Morro in the Lower East Side (Photo by Asma Barakat) NEW YORK — Since January, Puerto Rican activists in the city have been uplifting ...

It doesn't receive as many visitors or as much adoration as its sister fortification, El Morro, but visitors are typically just as amazed by the majesty and significant history of the site.

Kayaking in the Vieques Bioluminescent Mosquito Bay at night, ziplining through the rainforest, hiking to waterfalls, and exploring El Morro Fort are perfect activities for adventurous travelers.