As the pictures will show, there were some amazing views from up top, and it was a once in a lifetime experience. That being said, they way oversold the tickets for the Monday after Easter, which meant we were literally trapped on the tip top outside for what felt like an eternity (apparently about half an hour) with more people being let up the stairs to where we were, along with masses of people around us also wanting down, and no clue what was going on since we couldn't see the stairwell and people seemed to be moving forward towards the stairs slower than the earth was spinning. Did I mention there wasn't anyone from the museum up the to let us know what was going on? Any other day, I imagine it's not so crowded, but it felt even worse, because the stairwell to get up, aside from being long, was super narrow and the walkway was curved to mirror the dome as it wound around inside the ceiling of the cupola, so I really wonder what a fire marshal or lawyer would have thought of the whole thing. If you have any fear of heights or crowds, it's not recommended, but if you want great views and have lots of time to kill, very worthwhile.
Eye level with the cupola. This was only part of the way up, as the tour let you go literally all the way to the top of the cupola.