1600 Pennsylvania Avenue is an MSNBC television program hosted by David Shuster that ended in 2009.
 The show is a panel discussion of news and trends in American politics among the panelists and anchor.
 It is a continuation of the show Race for the White House, which was originally hosted by David Gregory and aired in the same time slot from March to November 2008.
 Shuster became the host of the show when Gregory became moderator of NBC's "Meet the Press".
Greenknowe Tower is a 16th-century tower house, located just west of the village of Gordon, in the Scottish Borders.
 Although a roofless ruin, the stonework of the tower is well preserved, and represents a fine example of a later tower house, built more as a residence rather than as a place of defence.
 The building is located at [ NT639428] , beside the A6105 road.
 It is a Scheduled Ancient Monument, and is in the care of Historic Scotland.
A tower castle is a small castle that mainly consists of a fortified tower or a tower-like structure that is built on natural ground.
 It is thus different from the motte-and-bailey castle, which it may resemble, but whose main defensive structure is built on a "motte" or artificial hill.
 The tower castle is occasionally also described as a tower house castle or a tower house.
Pins and Needles is an idiom revue with a book by Arthur Arent, Marc Blitzstein, Emmanuel Eisenberg, Charles Friedman, David Gregory, Joseph Schrank, Arnold B. Horwitt, John Latouche, and Harold Rome and music and lyrics by Harold Rome.
 The title "Pins and Needles" was created by Max Danish, long-time editor of the International Ladies Garment Workers Union (ILGWU)'s newspaper "Justice".
 It ran on Broadway from 1937 to 1940, was revived in 1978, and produced again in London in 2010 to positive reviews.
 In 2016, the show ran at the Provincetown Playhouse in New York City, where it was produced by the Steinhardt School at New York University.
 The revue was also performed in 1938 in the White House for Franklin and Eleanor Roosevelt.
Kinnairdy Castle is a tower house, having five storeys and a garret, two miles south of Aberchirder, Aberdeenshire, Scotland.
 The alternative name is Old Kinnairdy.
Bawnboy (Irish: "an Bádhún Buí" , meaning "the yellow bawn" ) is a small village in a valley at the foot of Slieve Rushen, between Ballyconnell and Swanlinbar, in County Cavan, Ireland.
 The current population is about 250.
 A bawn is the defensive wall surrounding an Irish tower house.
 It is the anglicised version of the Irish word "badhún" meaning "cattle-stronghold" or "cattle-enclosure" – its original purpose was to protect cattle during an attack.
 The remains of a late medieval bawn is to be seen at Bawnboy House, which is the origin of the village name.
 The earliest surviving mention of the placename is in the 1664 Hearth Money Rolls for Templeport where it is called Baonboy'.
 Another name for the village is Kilsub or Kilsob.
 The 1622 Survey of County Cavan states: "Sir Richard Greames, holdeth 1000 acres of this land, upon which there is built a Bawne of stone and lyme, sixty foot square and nine foot high, with a little stone house within, where in Lieutenant William Ruttledge dwelleth and hath a lease thereof and of 200 acres of land for 21 yeares and the rest of Sir Richard’s 1000 acres are sett to the Irish from yeare to yeare, who plowgh after ye Irish fashion."
Plague Town is a 2008 American horror film directed by David Gregory and written by David Gregory and John Cregan.
David Gregory (20 December 1625 – 1720) was a Scottish physician and inventor.
 His surname is sometimes spelt as Gregorie, the original Scottish spelling.
 He inherited Kinnairdy Castle in 1664.
 Three of his twenty-nine children became mathematics professors.
 He is credited with inventing a military cannon that Isaac Newton described as "being destructive to the human species".
 Copies and details of the model no longer exist.
 Gregory's use of a barometer to predict farming-related weather conditions led him to be accused of witchcraft by Presbyterian ministers from Aberdeen, although he was never convicted.
Newton's minimal resistance problem is a problem of finding a solid of revolution which experiences a minimum resistance when it moves through the homogeneous fluid with constant velocity in the direction of the axis of revolution, named after Isaac Newton, who studied the problem in 1685 and published in 1687 in his Principia Mathematica.
 This problem is considered as one of the first problems solved in the calculus of variations, which appeared even before the brachistochrone problem.
 Newton published the solution in Principia Mathematica without his derivation and David Gregory was the first person who approached Newton and persuaded him to write an analysis for him.
 Then the derivation were shared to his students and peers by Gregory.
Orchardton Tower, is a ruined tower house in Kirkcudbrightshire, Dumfries and Galloway, south west Scotland.
 It is located 4 miles (6.1km) south of Dalbeattie, and 1 mile (1.7km) south of Palnackie, in Buittle parish.
 It is remarkable as the only cylindrical tower house in Scotland.
 Orchardton Tower is in the care of Historic Scotland, and is a Category A listed building,and a Scheduled Ancient Monument.

Question: What tower house did David Gregory inherit in 1664?
Answer: Kinnairdy Castle