The Morro Castle was completed in 1640 and was built to protect the city of Havana from unfriendly ships in the surrounding waters. Today, it acts as a welcome port for tourists sailing into Havana. Start with a visit to the lighthouse and museum then take a walk around the top of the castle to take in the amazing panoramic ocean views. If you're up for it, stick around until 9 pm when cannons are fired every night; a tradition that once signaled when it was time to close the walls of the city.
