Seneca Creek State Park is home to several historic landmarks. Black Rock Mill is a partially restored mill in the park that includes exhibits featuring a history of area floods. The Seneca Schoolhouse is a restored 19th century schoolhouse which was built for area children of local quarry laborer. Parts of the park are located on land once a part of an estate owned by the Clopper Family. Near the Clopper Lake Day Use Area, The Woodlands, an area dedicated to commemorating life for the Clopper Family, offers visitors a look into life in the area in the 19th Century along a self-guided trail. Just west of where Seneca Creek empties into the Potomac is the Seneca Quarry. Remains of the stone cutting mill, built in 1837, still stand off Tschiffely Mill Road, though there are no interpretive signs. The mill cut the red sandstone for the Smithsonian Castle. Above the quarry site is the restored quarry masters house. Both are part of the state park.
You are seeking a small cache, a clear Lock n Lock in this case. Follow the Seneca Greenway Trail the whole way to GZ, the cache is not far from the path. The hide is within Seneca Creek State Park so NO night caching please!
