Like nomads settling in for a stay this is the largest tent refugee camp on the Presidio Reservation. United States Army General Hospital is in the background. On April 18, 1906 at 5:15 AM a quake of 8.25 on the Richter scale hit San Francisco. Greater destruction came from the fires afterwards. The city burned for three days. The combination destroyed 490 city blocks and 25,000 buildings, leaving 250,000 homeless and killing between 450 and 700. Estimated damages, over $350 million