the fifth battalion of the military police, known as the batalhão harmonia is located in the praça da harmonia (harmony square), in the neighborhood saúde, close to the city centre and it also appears on the list of forts of rio de janeiro.

it's construction in the germanic style has been conserved, which awards it an air of grandeur and catches the attention of visitors to the area - the fort known as fortaleza de santa margarida in ilha das cobras is one of three fortresses built on the island once known as ilha de pranapecu or ilha das madeiras, in guanabara bay, rio de janeiro.