General George Washington hoists the first United States flag, the Continental Union Flag, at Prospect Hill.

George Washington was a Founding Father and the first president of the United States, serving from 1789 to 1797. As commander of the Continental Army, Washington led Patriot forces to victory in the American Revolutionary War against the British Empire. He is commonly known as the Father of the Nation for his role in bringing about American independence.

The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States also asserts sovereignty over five major island territories and various uninhabited islands in Oceania and the Caribbean. It is a megadiverse country, with the world's third-largest land area and third-largest population, exceeding 340 million.

The Continental Union Flag was the flag of the United Colonies from 1775 to 1776, and the de facto flag of the United States until 1777, when the 13 star flag was adopted by the Continental Congress. It was a variant of the British 'Red Ensign.'

The Prospect Hill Monument, also occasionally called the Prospect Hill Tower is a stone structure in Somerville, Massachusetts. It is a block away from the heart of Union Square, a neighborhood in Somerville. Its name is formally the Prospect Hill Memorial Flag Tower and Observatory.