Sat & Sun 10 am–4 pm
Peirce Mill Open House at Rock Creek Park
A working 1820s grist mill in Rock Creek Park, open for the rare weekend you can actually walk inside.
Peirce Mill at 2401 Tilden St NW is open 10 am–4 pm both Sept 26 and 27; rangers explain the milling process and suggest nearby hikes.
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Updated Tuesday, September 22, 2026 · real listings, pulled from 130+ sources and reviewed by a person.