The Largo do Carmo in Lisbon was ground zero for the 1974 Carnation Revolution, which saw liberal military forces overthrow Portugal’s autocratic government. Using the country’s Eurovision song entry as a signal, troops suddenly surrounded the Quartel do Carmo in the northeast corner of the square. Marcelo Caetano, Salazar’s successor, had no choice but to surrender power, setting off a raucous celebration throughout the nation. Click the above image to enlarge, click to view my high-resolution photo gallery, or click to read my feature article “Lisbon: A Warning to the Free World.”