Mount Pleasant is a historic mansion in Philadelphia, Pennsylvania, atop cliffs overlooking the Schuylkill River.

Two small symmetrical pavilions flank the main house, an office and a summer kitchen.

The interiors contain the original paneling with ornamental carving, and still show the "elegance of the lifestyle of colonial elites," as well as souvenirs of Macpherson's life and times and period furniture by craftsmen such as Martin Jugiez.

Arnold purchased the mansion on March 22, 1779, for his new bride, and specifically made the property over to her, although, due to the high price of the estate and Benedict's deteriorating funds, he had to sell it, thus the couple never got a chance to move in.

In 1792, the mansion was purchased by Jonathan Williams, first superintendent of West Point and grandnephew of Benjamin Franklin.