Originally built to protect Lake Nicaragua and its port from English pirates, El Castillo, Fortress of the Immaculate Conception is located on the shores of Rio San Juan in the south of the country.
The site is full of interesting history and is open to general public. It also houses a small museum which tells the fortress´ intriguing history and where you can visualize the past. The town adjoining the fortress goes by the same name and is charming with its cobblestone streets and laidback atmosphere. The surrounding area is home to a big biodiversity.