Morro Castle (or Castillo de los Tres Reyes Magos del Morro)
Named after the Three Magi in the bible, Morro Castle is one of the most historic and popular sites in the city. Built in 1589, it is situated at the mouth of Havana Harbour and was originally built as a fortress guarding the entrance to Havana bay.
“Morro” in Spanish means rock, which could be viewed miles from the sea and therefore act as a navigational landmark. You can also get excellent views of the city from the castle.