It's the Robert C. Byrd Green Bank telescope in West Virginia. Over 400 ft tall. The dish is over 2 acres in area, about 300 ft across. There's lots of fog in the morning, and the mountains all around just make it an awesome thing. The last morning there I went up to the dish, and to the receiver room all the way at the top and took some pictures. Very cool.
View from the dish
View from the top of the telescope