Sat & Sun 10–10:45 am
Ranger Tour at Peirce Mill
A ranger walks you through DC's last working 19th-century gristmill, gears and all, on Rock Creek's banks.
45-minute ranger-led tour of Peirce Mill at 2401 Tilden St NW, running 10:00–10:45 am on Sept 26 and 27, 2026; check the NPS listing for cost details.
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Updated Tuesday, September 22, 2026 · real listings, pulled from 130+ sources and reviewed by a person.