The Vatican Christmas Tree, also called the Saint Peter's Square Christmas Tree, is the decorated tree that is erected annually in the Saint Peter's Square directly in front of St. Peter's Basilica in the Vatican City to celebrate the Christmas holiday season.
A "Christmas tree" was a type of alert area constructed by the United States Air Force for the Strategic Air Command (SAC) during the Cold War.
 Oftentimes, bombers or tanker aircraft were stationed next to a readiness crew building (RCB), also known as "mole hole" facilities.
 The alert apron, also known as an alert ramp, received the name "Christmas tree", because in planform it resembled a tree of the same name.
Ainslie Glen (Scottish Gaelic: "Gleann nam Màgan" ) is a small community in the Canadian province of Nova Scotia, located in Inverness County on Cape Breton Island.
 In 2016, a tree on Crown Lands was chosen to become the Boston Christmas Tree.
The Mount Ingino Christmas Tree is a lighting illumination in the shape of a Christmas tree that is installed annually on the slopes of Mount Ingino (Monte Ingino in Italian) outside the city of Gubbio, in Umbria region in Italy.
 The tree is also called the Gubbio Christmas Tree or "the biggest Christmas tree in the world".
 In 1991 the Guinness Book of Records named it "The World's Largest Christmas Tree".
The White House Christmas Tree, also known as the Blue Room Christmas Tree, is the official indoor Christmas tree at the residence of the President of the United States, the White House.
 The first indoor Christmas tree was installed in the White House sometime in the 19th century (there are varying claims as to the exact year) and since 1961 the tree has had a themed motif at the discretion of the First Lady of the United States.
The first official Christmas tree in the city of Chicago was installed in 1913 in Grant Park and lit on Christmas Eve by then-mayor Carter Harrison.
 This first tree was a 35 ft tall spruce tree.
 In December 1956 the official tree, though still installed in Grant Park (at Michigan Avenue and Congress Parkway), was not an individual tree.
 The tree was a combination of many smaller trees, stood 70 ft tall, and was decorated with over 4000 lights and 2000 ornaments.
 Beginning with Christmas 1966 the official Chicago Christmas tree was placed in Civic Center Plaza, now known as Daley Plaza.
 With the exception of 1981, the tree has been installed in Daley Plaza ever since.
Lisa Lucas is a former child actress best known for her role as "Addie Mills" in the Emmy-winning Christmas television special, "The House Without a Christmas Tree".
 It first aired on CBS-TV in December 1972, spawned three holiday-based sequels from 1973–1976 with the same cast, "The Thanksgiving Treasure" (also listed elsewhere as "The Holiday Treasure") (1973), "The Easter Promise" (1975) and "Addie and The King of Hearts" (1976). "
USA Today" called "A House Without a Christmas Tree" "beautifully acted" and the "Spartanburg Herald-Journal" called it a "Christmas treasure" and said it was full of heartwarming moments, especially when Addie gives away the Christmas tree she wins, or finds the star belonging to her mother.
The Boston Christmas Tree is the City of Boston, Massachusetts' official Christmas tree.
 A tree has been lit each year since 1941, and since 1971 it has been given to the people of Boston by the people of Nova Scotia in thanks for their assistance after the 1917 Halifax Explosion.
 The tree is lit in the Boston Common throughout the Christmas season.
The Milwaukee City Christmas Tree (1913–1995; 2006–present), also known as Milwaukee City Holiday Tree (1995–2006) is a pine tree that is placed at city hall and decorated by the city council of Milwaukee, Wisconsin, during the Christmas holiday season.
 The tradition began in 1913 and continues to this day.
Edward Hibberd Johnson (January 4, 1846 – September 9, 1917) was an inventor and business associate of American inventor Thomas Alva Edison.
 He was involved in many of Edison's projects, and was a partner in an early organization which evolved into the General Electric Company, one of the largest Fortune 500 companies in the United States.
 When Johnson was Vice President of the Edison Electric Light Company, a predecessor of Con Edison, he created the first known electrically illuminated Christmas tree at his home in New York City in 1882.
 Edward H. Johnson became the Father of Electric Christmas Tree Lights.
 Ironically he died of an electrical accident.

Question: In 2016, a tree on Crown Lands was chosen to become the City of Boston, Massachusetts' official Christmas tree, also known as ?
Answer: Boston Christmas Tree