National parks offering free admission through Sunday to celebrate centennial

Happy 100th birthday, National Park Service! The agency is celebrating its centennial this weekend, and we’re all invited to the party – for free. 

In honor of the milestone birthday, admission is free to all national parks and historic sites today through Sunday. Parks will also be holding special…

from Baltimore Sun
via http://baltimorecheckbook.tumblr.com/post/149461413652