I think the "high Point" is at the Hooker 100-inch telescope at the Visitors' Gallery. You have to climb about three short flights of stairs.
That's as high as I have been anyway.
We were up there on the 5th and had a great sandwich. They are normally closed on Mondays but since it was the day after the holiday they were open. While we were there I saw about twenty people enjoying the views and most of them eating. Good fresh food and priced reassembly for where you were. You ...