James Lick observatory.
View inside the main (160-inch diameter) telescope dome.

It's pretty dark here, actually.
I was with a group of visitors.
The tour guide was instructing us to use a support while taking photographs,
so as to prevent blurring of the images.

Do it exactly like THAT photographer!!! LOL

Notice the spiral staircase which allows you to step up to a platform,
from where you can maneuver and view the telescope.
We were told that it's so well balanced you can move it with one hand!