The monumental 16th Spanish century fortress of El Castillo San Felipe del Morro, (usually referred as El Morro) stands at the western end of Old San Juan in Puerto Rico. It repelled raids by Dutch, English and pirates led by Sir Francis Drake. It rises nearly 45m / 150ft above the sea, has walls 4.5m / 15ft thick. This fort was made with six levels of gun emplacements,ramparts, tunnels and dungeons.
