The Fortaleza de São Marcelo is a historic fort located in the bay of Salvador, Brazil. Built in the 17th century, it was designed to protect the city from pirate attacks and foreign invasions. The fort is circular in shape and features thick stone walls, making it a significant example of colonial military architecture. Today, the fort is a popular tourist attraction and is recognized as a cultural heritage site. Visitors can explore its interior, enjoy panoramic views of the bay, and learn about its history through informative displays. The fort is also a symbol of Salvador's rich colonial past.