Mount Vernon, located in Fairfax County, Virginia near Alexandria, was the plantation home of the first President of the United States, George Washington; it is also his burial place. The estate is situated on the banks of the Potomac River across from Prince George's County, Maryland.
You can take a really quick tour inside the mansion, but pictures are not allowed. I was impressed by the choice of colors for the interior (for example, the dining room is bright green).
The mansion has a wonderful view of the Potomac River.
You can stroll around the estate and actually see how things used to be back then; the farm, the gardens, where the slaves of the estate used to live etc. You can have a chat with costumed historic interpreters who are eager to answer all your questions about life on the estate during the 18th century.
And, of course, everything is green.