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Yup, that’s LA-78, one of sixteen Nike missile sites comprising “the ring of supersonic steel” built around Los Angeles (and other major cities; ~275 sites nationwide) in the 1950’s to defend against the threat of Russian heavy bombers. Nearly all of them have been completely demolished. You can find a list of all the sites with a brief description of their current state on Wikipedia [here](http://en.wikipedia.org/wiki/List_of_Nike_missile_locations#California).
If you’re into this sort of thing, [LA-43](https://www.google.com/url?sa=D&oi=plus&q=https://maps.google.com/maps?ie%3DUTF8%26cid%3D9769126419259496623%26q%3DLA-43%2BNike%2BMissile%2BSite%2B%28L%29%26iwloc%3DA%26gl%3DUS%26hl%3Den) in Rancho Palos Verdes is the most easily accessed interesting site as it’s on public land that hasn’t been redeveloped (no fences or anything). LA-88 and LA-94 look *quite* interesting from aerial views but those sites are reportedly now being used by the LAPD SWAT team and US Forest Service, respectively.
**edit**: I’m wrong. This is the [AT&T Topanga Ridge microwave relay tower](https://maps.google.com/maps?q=34.083943,-118.63841&hl=en&sll=37.269174,-119.306607&sspn=17.020769,33.815918&t=h&z=17) built in 1979. They’re [less than two miles apart](https://maps.google.com/maps?saddr=34.083943,-118.63841&daddr=34%C2%B003%E2%80%B235%E2%80%B3N+118%C2%B038%E2%80%B246%E2%80%B3W&hl=en&ie=UTF8&ll=34.070507,-118.642259&spn=0.03466,0.066047&sll=37.473006,-96.281638&sspn=33.780033,67.631836&geocode=FWcUCAIdtrjt-A%3BFcq1BwIdoZrt-A&t=h&mra=ls&z=15) so visit both!