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, the successor to the late dictator António de Oliveira Salazar, 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.”