From Indeed.com:

Volunteer Opportunity - Museum Volunteer
Idealist.org
Washington, DC

ORIGINAL JOB LISTING
Do you have a passion for early American history, the decorative arts, architecture, or museums in general? Dumbarton House, a Federal period historic house museum in Georgetown, Washington, DC, is currently recruiting dedicated volunteers to bring history to life through a variety of opportunities. Dumbarton House, headquarters of The National Society of The Colonial Dames of America, offers volunteers and visitors an opportunity to enhance their appreciation of early American history and strives to inform and educate the public about life in Washington during the early days of the Republic (circa 1800) and about Federal period decorative arts and architecture.

BENEFITS
-complimentary individual museum membership (includes 10% discount on Gift Shop purchases, invitations to private Museum events and programs, discounts on admission to public programs, monthly e-news and bi-annual Events Calendar, and two guest passes for public tours);
-ongoing monthly enrichment programs featuring expert lectures or field visits to other sites of interest;
-free parking;
-annual social events, including the annual Appreciation Dinner;
-monthly newsletter for museum volunteers and staff, Whats New on Q?; and
-access to the Dumbarton House research library.
PUBLIC PROGRAMS VOLUNTEERS help facilitate the Museum day time and evening programs, including visitor services, on-site registration, and/or lead activities or tours. Public Programs Volunteers are expected to commit to a minimum of three programs a year. Training and ongoing enrichment is provided for all Public Program Volunteers. Training for new Public Program Volunteers is scheduled for the winter 2010.
GARDEN VOLUNTEERS: Garden volunteers help maintain Dumbarton Houses formal, period, and herb gardens that were partly created under the guidance of architectural historian Fiske Kimball in 1931. Garden Volunteer commitment may be seasonal and based on garden needs.
BEHIND-THE-SCENES VOLUNTEERS: Marketing and Office volunteers help promote the Museum and Museum programs as well as assist behind-the-scenes with Museum operations. Behind-the-scenes Volunteer commitment may be project-based or regularly scheduled weekday shifts.
RESEARCHERS: Researchers are needed to work with curatorial and education staff to research topics related to the interpretation of the Museum. Possible project topics include occupants of the house, objects in the collection, archival material for preservation, the history of the property, and social culture of the 19th century. Researcher commitment may be project-based or regularly scheduled weekday shifts.

For more information, view the full listing by clicking here.