That tall transmitter tower in San Francisco
Ever since I saw it, I'd wondered about the tall transmitter tower in San Francisco. Turns out it's the "Sutro Tower" and supports radio and television antenna. It can seem quite a menacing structure as it towers over the hill.
Further Sutro Tower details can be found—unfortunately it seems no live web cam views now exist. The view from the top must be pretty awesome and somewhat freaky, I would imagine. It is possible to find some links to "satellite" views of the structure on various mapping sites.
Actually, I also just found a construction photograph: (Yay for libraries! :-) )
It's all very Triffid/Tripod-ish...
I happened to be looking for the Sutro Tower after I found a reference to this famous picture of San Francisco damage after the 1906 earthquake—apparently taken from a kite-mounted camera:
I'd been intending to track down the photographs after I read of their existence in Adventures from the Technology Underground but then they were featured on Digg.com which saved me the trouble of looking for them.