Harriton House, originally known as Bryn Mawr, is an historic house which is located on the Philadelphia Main Line, and was most famously the residence of Founding Father Charles Thomson, the secretary of the Continental Congress.

[1] Originally built in 1704 by Rowland Ellis, a Welsh Quaker, it was called Bryn Mawr, meaning high hill.

[1] The Harriton Association was started in 1962 by a group of people who were concerned that the house and its surrounding grounds, which were privately owned at the time, would be subdivided and developed.

The association removed the 1926 additions and restored the house to look as it did when Charles Thomson lived there.

Tours are given from Wednesday through Saturday, and special events are held at the house throughout the year.