Doughoregan Manor () is a plantation house and estate located on Manor Lane west of Ellicott City, Maryland, United States. Established in the early 18th century as the seat of Maryland's prominent Carroll family, it was home to Founding Father Charles Carroll, a signer of the United States Declaration of Independence, during the late 18th century. A portion of the estate, including the main house, was designated a National Historic Landmark on November 11, 1971. It remains in the Carroll family and is not open to the public. History Doughoregan Manor is a colonial manor house built in the early 18th century. The slave plantation was founded on 7,000 acres patented to Charles Carroll I as "Doughoreagan" (sometimes spelled Doororegan) named for a family estate in Ireland, in 1702, and expanded to 10,000 acres as "Doughoreagan Manor" in 1717. The Georgian brick plantation house, built by Charles Carroll II around 1727, was enlarged and remodeled in 1832 by Charles Carroll V in the Greek Revival style. From 1766 to 1832, Doughoregan Manor was the country home of Charles Carroll of Carrollton, (Charles Carroll III) last surviving signer of the Declaration of Independence. He lies buried in the chapel attached to the north end of the mansion. Notable guests that have visited the manor include George Washington, Thomas Jefferson, John Adams, John Hancock, Benjamin Franklin, James Monroe, and Marquis de Lafayette. In 1861, the manor became the home of John Lee Carroll, who became Governor of Maryland. In its current configuration the Manor is a brick, two-storied, U-shaped building. The roof is in gabled sections, some with balustraded decks, and in the center is an octagonal cupola. The front center entrance has a one-story tetrastyle Doric portico and is similar to the rear portico. The chapel and kitchen are attached to the main block by hyphens. The private chapel attached to the manor house was built at a time when the founding of Roman Catholic parish churches was prohibited in the colony. The chapel served as the primary meeting place for the local Catholic community until as late as 1855 when nearby parishes were founded. The chapel continued to be open to the public on Sunday mornings for Mass until the 1990s. A vineyard was planted by Charles Carroll of Annapolis in 1770 with four types of grapes. The vineyard was maintained into 1796, becoming one of the longest surviving colonial