One of the main things we did at the top of Mauan Kea was visit the W.M. Keck Observatories. We were up there as part of a self-drive tour, the guides were pretty damn knowledgeable, lots of interesting info was imparted. 
The inside of the Keck telescope, staring up at the back of the 10m primary mirrors, the second largest optical telescope mirrors in the world. The large primary mirror is actually 36 smaller hexagonal mirrors, each one can be controlled independantly and moved by microns every fraction of a second. There is some amazing technology going on here. They keep the inside of the observatory refrigerated so that when they open the doors at night, there's no temperature difference. To go with an impressive telescope with impressive technology, there's also some impressive science going on here. At a cost to the user of just $50,000 a night. A snip! As you can imagine there's a long waiting list, for just for a couple of minutes on the telescope.
Keck has two telescopes. Which can be used together for judging distances, like how we use two eyes, by processing how the background moves behind the object for the two separate images. Its known as interferometry, though with my rudimentary knowledge of physics having a baseline of tens of metres for a pair of telescopes seems fairly pointless for the distances required. For example, the second Gemini telescope is in Chile. But these guys are probably better physicists than I am, so I trust them that they can make it work.
The Keck twin telescopes at sunset.
Keck opens up for a night of stargazing.
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