Don't get me wrong, the Green Bank Telescope is an amazing instrument, one of the best in the world, a stunning engineering accomplishment, and a fantastic scientific tool.
I, personally, have used it to find and study a new class of pulsar and to produce what is in some ways the most stringent test of Einstein's theory of gravity to date.
It's also *big*, the dish is 100 m by 110 m and the moving mass is about 7600 tonnes.
@xyzzy they have a rather nice visitor center and tours (though I don't think you get to go up to the receiver room). You might want to bring a film camera (they sell disposables) because digital cameras generate too much interference.
(I cheated, but when I was there they were arc welding all day and running our observations all night so I figured it would be okay.)
@anne @ROCKETDRAG check out this telescope
@anne visiting this is a bucket list item for me