I visited the site in the late 90’s. A winding road that made you feel carsick led to the observatory. They didn’t give tours, just let you see the place.
On the way down the mountain we stopped at a road side, “restaurant”. It was a family run shack with a dirt floor and goats and chickens wandering in and out along with the customers. Best lunch ever! Worth the trip. I remember a Mercedes pulled up and one of the most beautiful women on earth got out and got food to go.