Random fact: southern California beaches used to be covered right down to the water with oil derricks.
Here is that beach today:
Those aren't trees, they're oil derricks!
One by one they dried up and houses were built in their place. My parents bought one of these dried-up lots and built our house on it in the late 1960s.
Some of the derricks weren't removed, they were just covered up, like this one. That is Beverly Hills High School behind it.
This one is on west Pico Blvd. in Los Angeles, it's a little less obvious.
Some are still operating right in the middle of residential neighborhoods. This one is in a Long Beach neighborhood. We call that pump style a "nodding donkey."