Castillo San Felipe del Morro: this is the most important place in the history of Puerto Rico. This fort was built to protect the city of San Juan from foreign attacks and enemies. It was first constructed in 1539 and the layout you see today was designed in 1587. This fort survived many attacks from enemies and it still looks good. Everybody in Puerto Rico knows about el Morro and if you go to San Juan you have to go there. It is a big tourist attraction and you can also fly kites there.