Copacabana Fort (Army History Museum and Copacabana Fort)

This guide to Copacabana Fort in Rio opens with the one time its twin turrets fired for real: July 5, 1922, when young army officers turned the fort's own guns on Rio's government, sparking a revolt that a navy battleship answered from the bay by morning. It traces the fort's construction between 1908 and 1914 to guard Guanabara Bay, and its 1987 retirement as an artillery post. Look for the pastry café that now sits on the terrace beside the old turrets before you order.