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How long is 668 kilometers?

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It's about 7,000 times as tall as The Statue of Liberty.
In other words, 668 kilometers is 7,184 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 0.0001392 times that amount.
(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (pedestal base to torch peak)
The Statue of Liberty reaches 0.09299 kilometers including the pedestal. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about 9,000 times as tall as a Giant Sequoia (tree).
In other words, 668 kilometers is 8,800 times the height of a Giant Sequoia (tree), and the height of a Giant Sequoia (tree) is 0.00011 times that amount.
(a.k.a. Sequoiadendron giganteum, a.k.a. Sierra redwood, a.k.a. Wellingtonia)
Giant Sequoias of the Giant Sequoia National Monument located in Sierra Nevada, near Visalia, California can grow to heights of 0.076 kilometers. The wood from the Giant Sequoias is often brittle and prone to shattering when such trees are felled, and as a result the trees logged in the late nineteenth century were often usable only as shingles or matchsticks.
It's about 10,000 times as long as The Wingspan of a 747.
In other words, 668 kilometers is 9,750 times the length of The Wingspan of a 747, and the length of The Wingspan of a 747 is 0.000103 times that amount.
(a.k.a. Boeing 747, a.k.a. Jumbo Jet, a.k.a. Queen of the Skies) (for Boeing 747-8 series)
The wingspan of a Boeing 747-8 is 0.0685 kilometers. Fully loaded, the 747 can travel 8,288 km before refueling.
It's about 10,000 times as tall as The Cinderella Castle.
In other words, 668 kilometers is 11,600 times the height of The Cinderella Castle, and the height of The Cinderella Castle is 0.00008620 times that amount.
(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
Walt Disney World's Cinderella Castle is 0.0576 kilometers tall. The castle's architecture uses the optical trick known as "forced perspective" — the castle gets smaller near the top — to appear larger than it truly is.
It's about 10,000 times as tall as The Leaning Tower of Pisa.
In other words, 668 kilometers is 11,800 times the height of The Leaning Tower of Pisa, and the height of The Leaning Tower of Pisa is 0.00008470 times that amount.
(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
The Leaning Tower of Pisa stands 0.0564 kilometers tall along the angle of its lean. In May of 2008, in an successful effort to stabilize the tower, 70 tonnes of earth were removed from the tower's base on the side opposite the lean.
It's about 15,000 times as tall as Nelson's Column.
In other words, 668 kilometers is 12,940 times the height of Nelson's Column, and the height of Nelson's Column is 0.000077280 times that amount.
(London, England, United Kingdom) (from pedestal first step to tip of statue's hat)
Nelson's Column measures 0.05164 kilometers from the first step of the pedestal's base to the top of the statue's hat. While the London tower is the tallest, there are at least eight other monuments to Admiral Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronté throughout England, Scotland, Ireland, Canada, and Barbados.
It's about 15,000 times as tall as The Arc de Triomphe.
In other words, the height of The Arc de Triomphe is 0.0000710 times 668 kilometers.
(Paris, France)
The Arc de Triomphe stands 0.049 kilometers tall. France's Tomb of the Unknown Soldier from the First World War lies beneath the arch and is commemorated by the first eternal flame to have been lit in modern European history.