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How big is 6,601,668.10 square miles?

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It's about 200,000,000 times as big as Alcatraz
In other words, 6,601,668.10 square miles is 190,000,000 times the size of Alcatraz, and the size of Alcatraz is 0.00000000530 times that amount.
(a.k.a. The Rock) (California)
Alcatraz Island measures 0.034 square miles. 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 200,000,000 times as big as Buckingham Palace
In other words, 6,601,668.10 square miles is 220,000,000 times the size of Buckingham Palace, and the size of Buckingham Palace is 0.00000000450 times that amount.
(a.k.a. Buckingham House) (Westminster, London, England)
Buckingham Palace, the official residence of the British monarch, contains about 0.03 square miles 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 250,000,000 times as big as Croke Park
In other words, the size of Croke Park is 0.00000000380 times 6,601,668.10 square miles.
(a.k.a. Páirc an Chrócaigh) (Dublin, Leinster, Ireland) (stadium area)
Croke Park, the Gaelic games stadium of Dublin, hosts hurling and Gaelic football matches in a 0.025 square miles stadium. The Park offers rooftop tours, where fans can walk along the 44-meters-high walkway.
It's about 300,000,000 times as big as Windsor Castle
In other words, 6,601,668.10 square miles is 320,000,000 times the size of Windsor Castle, and the size of Windsor Castle is 0.00000000310 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 0.02 square miles. 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 350,000,000 times as big as Rogers Centre
In other words, 6,601,668.10 square miles is 333,000,000 times the size of Rogers Centre, and the size of Rogers Centre is 0.00000000300 times that amount.
(f.k.a. Skydome) (Toronto, Ontario, Canada) (entire complex)
Rogers Centre, a major sports stadium in downtown Toronto, measures a total of 0.0198 square miles over the entire complex. The video board of Rogers Centre has a total area of 0.000131 square miles.
It's about 350,000,000 times as big as a Polo field
In other words, 6,601,668.10 square miles is 340,822,118 times the size of a Polo field, and the size of a Polo field is 0.000000002934081880 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 0.0193698347 square miles. 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 400,000,000 times as big as The Principality Stadium
In other words, the size of The Principality Stadium is 0.00000000300 times 6,601,668.10 square miles.
(a.k.a. Stadiwm Principality, f.k.a. Millennium Stadium, f.k.a. Stadiwm y Mileniwm) (Cardiff, Wales, United Kingdom) (total footprint)
The 70,000-person-plus capacity stadium of Cardiff, Principality Stadium has a total footprint of 0.02 square miles. Over 40,000 tonnes of concrete and steel during the construction of the stadium.