Image from page 191 of "A history of the earthquake and fire in San Francisco; an account of the disaster of April 18, 1906 and its immediate results" (1906) from Flickr via Wylio

© 1906 Internet Archive Book Images, Flickr | PD | via Wylio

An earthquake flattened San Francisco and surrounding areas on this day in 1906.

You can find many related resources at The Best Sites To Learn About San Francisco and to The Best Sites For Learning About Earthquakes.