say win here and one at fort funston. using telescopes, they named a ship and target. the two different sightings allowed them to trianglely position the ship at sea. >> so it was a lookout, essentially >> it was a lookout. >> i doubt if we saw a japanese ship today -- >> it would probably say toyota on the side of it. >> they are really fun. if shows you what can you do in 60 seconds. >> the pri sidot maps. people -- presidio maps. people keep forgetting that the army was a major presence. before the city was functioning, the army was functioning. and there are maps from the 1800's that show the farmhouses in the valley, the eureka valley, and mission district that were done by the army. so the army is its own resource for the history of the city before there was a building department. they would have everything. you could find out what was the original house in an area. again, this is the 1800's more than the 1900's. but the earthquake obliterated a lot of records. >> there's the survey map that the government did. that's a great resource to just kind of show -- you