NP Guides are terrific, exhibits are well done and the NP Guides go out of their way to ensure that when there is a "sold out" ticket situation if there is space people who don't have tickets can get in on a stand by basis. There's no charge for tickets it is just for crowd management. Nice job with our tax dollars! Money well-spent. So interesting to see all the non-US visitors who are so interested in our story of Independence.