On October 31, 1941, carving and construction of Mount Rushmore National Memorial was completed after 14 years of work. The sculpture features portraits of former Presidents George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln, carved into the granite face of a mountain in the Black Hills of South Dakota.

The Mount Rushmore memorial cost nearly a million dollars. More than 400 workers—including surveyors and draftsmen, demolitions experts and sculptors—were employed in the project. The site covers more than 485 hectares (1,200 acres) and is visited by two million people each year. Each head is more than 18 meters (60 feet) tall. The four presidents were selected to recognize the role each had played in expanding the territory of the United States.

carve
Verb

to cut or slice through.

construction
Noun

arrangement of different parts.

expand
Verb

to grow or get larger.

granite
Noun

type of hard, igneous rock.

memorial
adjective, noun

something designed or written to preserve the memory of an event or person.

portrait
Noun

image of a person's face.

recognize
Verb

to identify or acknowledge.

sculpture
Noun

three-dimensional artwork that is carved, molded, or modeled to create its shape.

select
Verb

to choose.

territory
Noun

land an animal, human, or government protects from intruders.