|Location||Clymer St. and Morris Ave., Morrisville, Pennsylvania|
|Coordinates||40°12′29.1″N74°46′46.5″W / 40.208083°N 74.779583°W Coordinates: 40°12′29.1″N74°46′46.5″W / 40.208083°N 74.779583°W|
|Area||2 acres (0.81 ha)|
|NRHP reference No.||71000685|
|Added to NRHP||July 17, 1971 |
|Designated NHL||July 17, 1965 |
|Designated PHMC||January 27, 1949 |
Summerseat, also known as the George Clymer House and Thomas Barclay House, is a historic house museum at Hillcrest and Legion Avenues in Morrisville, Bucks County, Pennsylvania. Built about 1770, it is the only house known to have been owned by two signers of the United States Declaration of Independence, Founding Fathers George Clymer and Robert Morris, and as a headquarters of General George Washington during the American Revolutionary War. The house is now managed by the Morrisville Historical Society, which offers tours. It was designated a National Historic Landmark in 1965.  
Summerseat is located west of the central business district of Morrisville, sharing a property with what used to be Reiter Elementary School at the junction of Hillcrest and Legion Avenues. It is a 2+1⁄2-story masonry structure, built out of a combination of brick and stone. Its front and sides are brick, while the rear wall is stone. The main facade faces east, and is five bays wide, with a center entrance framed by pilasters and a fully pedimented gable. The interior follows a traditional center-hall plan, with four rooms on each floor. The interior retains some original features, despite having had non-residential uses. 
The house was built about 1770 for Thomas Barclay  , and was his house at the end of 1776, when George Washington occupied it as a military headquarters during the dark days of the New York and New Jersey campaign of the American Revolutionary War. After the war the house was purchased by Robert Morris, a signer of the Declaration of Independence, and the principal financier of the war effort. Morris fell upon financial hard times owing to failed real estate speculation, and sold the house in 1806 to George Clymer, another signer of the Declaration. It is Clymer who named the property "Summerseat", and it was his home until his death in 1813. 
The house was restored in 1931 and converted for use as a school administrative building in 1935.  Summerseat is now owned and operated as a house museum by the Historic Morrisville Society. The house is open to the public for tours on the first Saturday of each month from 10:00 a.m. to 1:00 p.m. Admission is $7.00 per person, children under the age 12 are free.
Morrisville is a borough in Bucks County, Pennsylvania, United States. It is located just below the falls of the Delaware River opposite Trenton, New Jersey. The population was 8,728 at the 2010 census.
George Clymer was an American politician, abolitionist and Founding Father of the United States, one of only six founders who signed both the Declaration of Independence and U.S. Constitution. Clymer was among the earliest patriots to advocate for complete independence from Britain. He attended the Continental Congress and served in political office until the end of his life. He was a Framer of the Constitution where he attempted unsuccessfully to regulate the importation of slaves. Clymer was himself a minor slave owner, at least briefly when seven years-old through inheritance.
Fonthill, also known as Fonthill Castle, was the home of the American archeologist and tile maker Henry Chapman Mercer, in Doylestown, Pennsylvania.
Pennsylvania was the site of many key events associated with the American Revolution and American Revolutionary War. The city of Philadelphia, then capital of the Thirteen Colonies and the largest city in the colonies, was a gathering place for the Founding Fathers who discussed, debated, developed, and ultimately implemented many of the acts, including signing the Declaration of Independence, that inspired and launched the revolution and the quest for independence from the British Empire.
West Overton is located approximately 40 miles (64 km) southeast of Pittsburgh, in East Huntingdon Township, Westmoreland County, Pennsylvania, United States. It is on PA 819 between the towns of Mount Pleasant and Scottdale. Its latitude is 40.117N and its longitude is -79.564W.
Carpenters' Hall is the official birthplace of the Commonwealth of Pennsylvania and a key meeting place in the early history of the United States. Carpenters' Hall is located in Independence National Historical Park in Philadelphia, Pennsylvania.
The William Brinton 1704 House is a historic house museum located 21 Oakland Road in Delaware County, Pennsylvania about five miles south of West Chester, Pennsylvania. Built in 1704, it is well-preserved example of an early Delaware Valley stone house, which served as a residence of one family for over 150 years. It was designated a National Historic Landmark in 1967. It is open for tours on weekends between May and October, or by appointment.
The Philadelphia Quartermaster Depot, now known as the Defense Logistics Agency Troop Support, was founded as the Schuylkill Arsenal in 1799.
The Gen. William Floyd House is a historic house on Main Street at Gifford Hill Road in Westernville, New York. Built in 1803, it was the last home of Founding Father William Floyd (1734–1821), a signer of the Declaration of Independence, and a driving force in the settlement of the area. It was declared a National Historic Landmark in 1971. The house is a private residence, and is not normally open to the public.
Borough House Plantation, also known as Borough House, Hillcrest Plantation and Anderson Place, is an historic plantation on South Carolina Highway 261, 0.8 miles (1.3 km) north of its intersection with U.S. Route 76/US Route 378 in Stateburg, in the High Hills of Santee near Sumter, South Carolina. A National Historic Landmark, the plantation is noted as the largest assemblage of high-style pisé structures in the United States. The main house and six buildings on the plantation were built using this technique, beginning in 1821. The plantation is also notable as the home of Confederate Army General Richard H. Anderson.
The George Taylor House, also known as George Taylor Mansion, was the home of Founding Father George Taylor, a signer of the United States Declaration of Independence, in Catasauqua, Pennsylvania in the Lehigh Valley region of eastern Pennsylvania. The home was built by Taylor in 1768 and designated as a National Historic Landmark in 1971.
The Nash-Hooper House, also known as the William Hooper House, is a historic house at 118 West Tryon Street in Hillsborough, North Carolina. Built in 1772 by American Revolutionary War general Francis Nash, it was home from 1782–1790 to Founding Father William Hooper, a signer of the United States Declaration of Independence. It is the only known home of Hooper's to survive, and was declared a National Historic Landmark in 1971. It is located in the Hillsborough Historic District; it is a private residence, and is not normally open to the public.
The Philadelphia Lazaretto was the first quarantine hospital in the United States, built in 1799, in Tinicum Township, Delaware County, Pennsylvania. The site was originally inhabited by the Lenni Lenape, and then the first Swedish settlers. Nearby Province Island was the site of the confinement of the Christian Moravian Indians who were brought there under protective custody from Lancaster, Pennsylvania, in 1763 when their lives were threatened by the Paxton Boys. The facility predates similar national landmarks such as Ellis Island Immigrant Hospital and Angel Island and is considered both the oldest surviving quarantine hospital and the last surviving example of its type in the U.S.
The George Nakashima House, Studio and Workshop is a historic artist's compound at 1847 and 1858 Aquetong Rd. in Solebury Township, Bucks County, Pennsylvania. The compound consists of houses and studio buildings designed and built by artist George Nakashima (1905-1990), which served as family homes and as his studio space. The studio-related buildings are open to the public for tours; the houses of the compound continue to serve as residences of the Nakashima family. In April 2014 it was also designated a National Historic Landmark. The site was listed on the World Monument Fund's 2014 Endangered Sites Watchlist.
The Thompson-Neely house is a historic house and farmstead in Solebury Township, Bucks County, Pennsylvania. It is part of Washington Crossing Historic Park, headquartered in nearby Washington Crossing. The oldest part of the house was built in 1702, according to the John Pidcock plaque. It was a temporary military hospital during the American Revolutionary War.
Downtown Altoona Historic District is a national historic district located at Altoona, Blair County, Pennsylvania. The district includes 240 contributing buildings in the central business district and surrounding residential areas of Altoona. The buildings were primarily built after about 1860 and include residential, civic, social, and religious buildings. Although it does not encompass the entire downtown, it is for the most part the most urban part of Altoona's downtown district. Notable buildings include the Cathedral of the Blessed Sacrament (1920s), First Methodist Episcopal Church, First Presbyterian Church, First Evangelical Lutheran Church (1896-1897), U.S. Post Office (1931-1933), Fraternal Order of Eagles Building (demolished), Altoona City Hall, Casanave Building (1890s), Hutchison Block, McCrory's Department Store (1937), and Aaron-Penn Furniture Building. Located in the district are the separately listed Central Trust Company Buildings, Mishler Theatre, and Penn Alto Hotel.
Boswell Historic District is a national historic district located at Boswell in Somerset County, Pennsylvania. The district includes 90 contributing buildings and 1 contributing site. It encompasses an area developed by the Merchant's Mining Company of Baltimore, Maryland starting in 1901. It includes the remaining extant mine resources and the archaeological remains of the mine. They consist of utilitarian industrial buildings, four types of vernacular housing, and a variety of commercial, social, and institutional buildings. Notable buildings include the First National Bank of Boswell (1919), Merchant's Coal Company office (1901), St. Stanislaus Roman Catholic Church (1918), and Sts. Peter and Paul Russian Orthodox Church (1918).
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