We want to show our kids Washington DC and related attractions. They have been asking for about a year after learning about history and government in school. It will be about 2 years before we can get organized, arrange vacation time off, and save enough to go. How does one go about estimating the cost for such a trip, and saving for it? Has anyone taken their family across the country to see this area? How many days should we plan to stay there? How can I accurately estimate the cost? I have never organized a trip like this before. We have gone to India but we only had to worry about plane tickets since we stayed with family. Planning a trip to a place I've never been, and knowing it's expensive, seems like an overwhelming task.