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How big is 400 square perches?

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It's about one-third as big as The Lincoln Memorial Reflecting Pool.
In other words, 400 square perches is 0.3210 times the size of The Lincoln Memorial Reflecting Pool, and the size of The Lincoln Memorial Reflecting Pool is 3.120 times that amount.
(Washington, D.C.) (pool surface area)
The Lincoln Memorial Reflecting Pool has a water surface area of 1,250 square perches. The Pool has a sloping bottom and extends to 80 cm (30 in) in depth at its center.
It's about one-fifth as big as a Polo field.
In other words, 400 square perches is 0.2016666670 times the size of a Polo field, and the size of a Polo field is 4.958677680 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 1,983.471070 square perches. 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.
It's about one-fifth as big as Windsor Castle.
In other words, 400 square perches is 0.190 times the size of Windsor Castle, and the size of Windsor Castle is 5.30 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 2,100 square perches. 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 six-and-a-half times as big as a Hockey rink.
In other words, 400 square perches is 6.66992970 times the size of a Hockey rink, and the size of a Hockey rink is 0.1499266180 times that amount.
(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 59.97064710 square perches. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about one-tenth as big as Buckingham Palace.
In other words, 400 square perches is 0.130 times the size of Buckingham Palace, and the size of Buckingham Palace is 7.70 times that amount.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 3,000 square perches 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 eight-and-a-half times as big as Fort Knox.
In other words, 400 square perches is 8.570 times the size of Fort Knox, and the size of Fort Knox is 0.1170 times that amount.
(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 46.70 square perches. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about one-tenth as big as Alcatraz.
In other words, 400 square perches is 0.110 times the size of Alcatraz, and the size of Alcatraz is 9.10 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 3,500 square perches. 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.