It's about 25,000 times as big as The Pentagon.
In other words, 3,500,000 dunams is 25,400 times the size of The Pentagon, and the size of The Pentagon is 0.00003940 times that amount.(a.k.a. United States Department of Defense Headquarters) (Washington, D.C.) (total floor area)
The Pentagon, the world's largest office building, contains a total floor area of 138 dunams. Built during World War II, the designers compensated for the steel rations then in effect by using 310,000 cu. m of concrete in the construction efforts.
It's about 30,000 times as big as Ellis Island.
In other words, 3,500,000 dunams is 31,500 times the size of Ellis Island, and the size of Ellis Island is 0.00003170 times that amount.(Jersey City, New Jersey and New York City, New York)(now officially part of the Statue of Liberty National Monument)
Ellis Island, home of the Ellis Island Immigration Station, is 111 dunams in total area. Nine-tenths of the island were artificially created after the New York-New Jersey borders had already been defined, leading to a sovereignty dispute which was settled by the US Supreme Court in 1998.
It's about 40,000 times as big as Alcatraz.
In other words, 3,500,000 dunams is 39,000 times the size of Alcatraz, and the size of Alcatraz is 0.0000260 times that amount.(a.k.a. The Rock) (California)
Alcatraz Island measures 89 dunams. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.
It's about one-forty-five-thousandth as big as The Land area of Earth.
In other words, 3,500,000 dunams is 0.0000234990 times the size of The Land area of Earth, and the size of The Land area of Earth is 42,555 times that amount.The Earth has a land area of 148,940,000,000 dunams. Only an estimated one-eighth of this area — or 18,618,000,000 dunams — is inhabitable by humans, with uninhabitable terrain such as deserts and high mountains covering the rest.
It's about 45,000 times as big as Buckingham Palace.
In other words, the size of Buckingham Palace is 0.0000220 times 3,500,000 dunams.(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 77 dunams of total floor space. The palace was first inhabited by Queen Victoria in 1831, although after the death of her husband in 1861, the Queen endeavored to spend as little time there as public opinion would allow.
It's about 65,000 times as big as Windsor Castle.
In other words, the size of Windsor Castle is 0.0000150 times 3,500,000 dunams.(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53 dunams. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
It's about 70,000 times as big as a Polo field.
In other words, 3,500,000 dunams is 69,766.086 times the size of a Polo field, and the size of a Polo field is 0.00001433361190 times that amount.(for field polo) (United States Polo Association rules; unboarded side maximum)
An outdoor polo field must measure 274.32 m in length and 146.304 m to in width for a total playing area of up to 50.16764160 dunams. Polo traces its origins to an Iranian (then Persian) war game from the 5th Century, which was played with as many as 100 players per side.