Richard, our tour guide, was fabulous. I could have listened to him all day! Museum exhibits were solemn, but need to be seen. It was crowded, so we took our time taking breaks while in the museum. Don't miss the Observatory. And don't forget to ask your guide for a physical ticket when you check in. We had to make a last minute call to Viatour as they were not linked to our reservation on our phones. They were sent to us without any problems via email. Customer service was efficient and professional. Thanks, Viatour. It was a great day.