Parkfield Water Tower
Parkfield, dubbed the Earthquake Capital of the World.
Scientists (geologists) have set up equipment to monitor the San Andreas Fault at this location, predicted to be the site of a huge quake at some point in the future.
Something that I found to be interesting here, you can stand on the Pacific Plate then walk a few feet across a small creek and be standing on the North American Plate. This is where the two clash together, the Pacific Plate pushing under the North American Plate.