On April 18, 1906, at 5:12 am, the coast of Northern California was rocked by a 7.8-magnitude earthquake. One of the deadliest natural disasters in United States' history, the earthquake killed approximately 3,000 people and destroying 80 percent of the city of San Francisco. Sourced from the Prelinger Archives, the video below provides a side-by-side comparison of a drive down Market Street in San Francisco. 

The footage on the left was shot by Harry and Herbert Miles on April 14, 1906, and shows the daily hustle and bustle of the city just four days before the earthquake. The source of the footage on the right is unknown, but it was taken shortly after the catastrophic event, displaying the buildings crumbled by the tremors and subsequent fires, the thick haze of debris, and the clusters of the affected shuffling through the streets, surely still in shock.