23. Mount Vernon
Mount Vernon was once the plantation of the first US president, George Washington. The estate is located on the Potomac River in Fairfax County, Virginia. It is built in the style of Palladian architecture, as well as traditionally in Georgian Renaissance buildings.
As the Washington family's fortunes continued to decline, the descendants who inherited the house could not manage the maintenance, and it began to fall into ruin. Thankfully, the Mount Vernon Ladies Association saved the place from destruction in the 1800s and preserved it until it was declared a Historic Site in 1960.
