This document provides summaries of 20 famous historical photographs from the 20th century, including:
- The first photograph taken in 1826 by Nicéphore Niépce that took 8 hours of exposure.
- A 1906 photograph of the devastation caused by the San Francisco earthquake and fire.
- A 1972 photograph of a naked 9-year-old girl fleeing a napalm attack in Vietnam that became one of the most published images from the war.
- An iconic 1989 photograph showing a lone man blocking tanks in Tiananmen Square during the student uprising in China.