The National Park Service is pleased to announce that Peirce Barn and Peirce Mill have opened for the season. Peirce Barn and Peirce Mill are located on Tilden St., across from Picnic Area 1 in Rock Creek Park. Peirce Barn and Peirce Mill will be open Wednesday – Sunday 10 AM to 4 PM (except July 4) until November 1. https://www.nps.gov/rocr/learn/news/national-park-service-opens-perice-mill-for-season.htm