and a barrier island and a prairie barrier island is a very unique place. think about all the barrier islands along the coastal bend along texas here. a lot of them have been developed. but to preserve an ecosystem intact is what we're trying to do. so what i'd have to say is since the '60s, the place has blossomed again. 00 years of anything will have an impact on the land, and i'd have to say that being a national seashore, the land has been able to take a break, to relax and restore itself. and so now it's this great natural place. >>> 100 years ago this past august president woodrow wilson signed legislation creating the national park service. today we're featuring national and historic sites throughout the country. this is american history tv, only on c-span3. >>> so we're here at promontory summit, utah, golden spike national historic site. walking you over to where the transcontinental railroad was completed. leland stanford's name and the big four marked there. another thing you can see at the site is a connection with the resources that would have