being said i have to get off the boat, unfortunately, but i hope you enjoyed your ride on the charles f. mercier, and if you have any questions please don't hesitate. on behalf of the national park service, thank you for joining us on the charles f. mercer and i hope you enjoyed your ride, okay? [ applause ] >> you did a fine job. >> thank you. >>> you've been watching our weekly series, american artifacts on c-span3 american history tv. you can view this and all our other programs online at c-span.org/history. >> 100 years ago, president woodrow wilson signed the bill creating the national park service, thursday, we look back on the past century of these caretakers of america's natural and historic treasures. beginning at 10:00 eastern, and throughout the day, we take you to national park service sites across the country as recorded by c-span. at 7:00 p.m. eastern, we're live from the national park services most visited historic home, arlington house, the robert e. lee memorial at arlington national cemetery. join us with your phone calls as we talk with robert stanton, former national park ser