Puerto Rico Old San Juan El Morro Stock Photo 200155616-00116th Century Style,Capital Cities,Castle,Color Image,Day,Fort,Harbor,History,Morro Castle,No People,Outdoors,Photography,Puerto Rico,Sea,Surrounding Wall,Travel Destinations,Travel10,VerticalPhotographer Brooke SlezakCollection: The Image Bank El Morro is a Spanish fortress that was constructed in 1540 to keep seaborne enemies out of San Juan. Inside the walls is a veritable labyrinth of chambers, barracks, hallways and prison cells. It survived many attacks in it's time. Today it welcomes multitudes of arriving cruise ships and aircraft to the busiest port in the Caribbean. Over two million visitors a year explore theme windswept ramparts and passageways, where the history of 400 years of Spain in Puerto Rico comes alive.