The Fortaleza de São João is a historic fort located in Cabo Frio, Brazil. Built in the 17th century, it was designed to protect the region from invasions and piracy. The fort features thick stone walls and strategic positioning near the coastline, allowing for effective defense against maritime threats. Today, the fort is a popular tourist attraction, showcasing its well-preserved architecture and offering stunning views of the surrounding area. Visitors can explore the fort's interior, learn about its history, and enjoy the scenic beauty of Cabo Frio's beaches nearby.