It's about 1,000,000 times as big as The United States Capitol.
In other words, 253,336,000 dunams is 1,100,000 times the size of The United States Capitol, and the size of The United States Capitol is 0.000000910 times that amount.(Washington, DC) (Immediate grounds size)
The grounds of United States Capitol, at the center of Washington DC's quadrants, consists of about seventeen buildings on a 230 dunams plot. While the Capitol Building is the central feature, other buildings include the Supreme Court Buildings and the Library of Congress Buildings, as well as several monuments and sculptures.
It's about 2,000,000 times as big as The Pentagon.
In other words, 253,336,000 dunams is 1,840,000 times the size of The Pentagon, and the size of The Pentagon is 0.0000005430 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 2,500,000 times as big as Ellis Island.
In other words, 253,336,000 dunams is 2,280,000 times the size of Ellis Island, and the size of Ellis Island is 0.0000004390 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 3,000,000 times as big as Alcatraz.
In other words, 253,336,000 dunams is 2,800,000 times the size of Alcatraz, and the size of Alcatraz is 0.000000360 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 3,500,000 times as big as Buckingham Palace.
In other words, the size of Buckingham Palace is 0.000000300 times 253,336,000 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 5,000,000 times as big as Windsor Castle.
In other words, the size of Windsor Castle is 0.000000210 times 253,336,000 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 5,000,000 times as big as a Polo field.
In other words, 253,336,000 dunams is 5,049,788.910 times the size of a Polo field, and the size of a Polo field is 0.000000198028080 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.