The Fortaleza de Santa Cruz da Barra is a historic fortress located in Niterói, Brazil. Built in the 16th century, it was designed to protect the entrance of Guanabara Bay from potential invasions. The fortress features thick stone walls and strategic positioning, making it a significant military structure during its time. Today, the fortress is a popular tourist attraction, offering visitors stunning views of the bay and the Rio de Janeiro skyline. It also houses a small museum that showcases the history of the fortress and its role in Brazil's colonial past.