On July 16, 1945 the atomic age began with the Trinity nuclear test.
The Medieval History of Stonehenge.
Why ancient Roman concrete is better than modern mixes
Old New York: film from the Library of Congress of New York City circa 1900.
A Short History of the Condom.
ICYMI, Friday's links are here, and include Bastille Day, the 47 names Disney considered for the 7 dwarfs, 1796 cases of Madeira found in a museum basement, and the stories behind iconic movie props.