The first major revolt of the 1848-1849 German revolutions began in Vienna.
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Marvel's 'Captain America: The Winter Soldier' premiered in Los Angeles.
Astronomer William Herschel first observed Uranus.
Luciano Pavarotti's final opera took place at New York Metropolitan Opera.
Itza, the last Mayan kingdom, was conquered by Spanish forces.
Apollo 9 and its crew returned to Earth after a 10-day mission orbiting Earth.
