Annandale’s oldest house is open to the public on Oak Hill Day, Oct. 21

The public will have a chance to take a peek inside the historic Oak Hill mansion on Saturday.

Oak Hill, an 18th century Georgian-style house at 4716 Wakefield Chapel Road, Annandale, is all that remains of the Ravensworth Tract, which dates back to the 1670s and once encompassed 22,000 acres.

Oak Hill is privately owned but is protected through a Fairfax County historic easement that requires the property to be open to the public one day a year.

This year’s open house, noon-4 p.m. on Oct. 21, celebrates the 275th anniversary of Fairfax County. Visitors are invited to walk through the first floor of the mansion and stroll the grounds to see some of the oak trees that gave the property its name and the original drive to the house, which is lined with protected boxwoods, some of which are more than 220 years old.

There will be a brief ceremony at 12:30. Several local history organizations will have displays, and the Annandale High School culinary arts program will provide free refreshments.

This will be the first Oak Hill Day since the property changed ownership. David and Amanda Sheetz, who had lived at Oak Hill since 2008, sold the property in June to Joseph Braceland for $1.42 million.

Parking for Oak Hill Day will be available at the Nancy Sprague Technology Center, 4414 Holborn Ave., with free shuttle bus service to the mansion.