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How long is 4 kilometers?

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It's about 80 times as tall as The Arc de Triomphe
In other words, 4 kilometers is 82 times the height of The Arc de Triomphe, and the height of The Arc de Triomphe is 0.012 times that amount.
(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.
It's about 85 times as tall as The Chicago Water Tower
In other words, 4 kilometers is 85.30 times the height of The Chicago Water Tower, and the height of The Chicago Water Tower is 0.0117 times that amount.
(Chicago, Illinois)
The Chicago Water Tower is 0.0469 kilometers tall. The tower's architecture was one source of inspiration behind the design of White Castle fast-food restaurants beginning with "Building Number 8," a prefabricated structure built in Minneapolis, Minnesota in 1936.
It's about 95 times as long as Ha'Penny Bridge
In other words, 4 kilometers is 93.20 times the length of Ha'Penny Bridge, and the length of Ha'Penny Bridge is 0.0107 times that amount.
(a.k.a. Droichead na Leathphingine, a.k.a. Liffey Bridge, a.k.a. Droichead na Life, f.k.a. Wellington Bridge) (Quay of Bachelors Walk, Temple Bar Neighborhood, Dublin, Ireland)
The Ha'Penny Bridge, crossing the River Liffey in Dublin, measures 0.0429 kilometers in total length. Over 30,000 pedestrians cross the breach each day.
It's about one-one-hundredth as long as The Grand Canyon
In other words, 4 kilometers is 0.00897 times the length of The Grand Canyon, and the length of The Grand Canyon is 111 times that amount.
(a.k.a. Gran Cañón) (Arizona) (Colorado River miles measure)
The Grand Canyon has a total length of 446 km along the course of the Colorado River at its bottom. Having opened in early 2007, the Grand Canyon Skywalk allows tourists to stand on a horseshoe-shaped glass walkway 1.10 kilometers above the floor of Granite Gorge.
It's about 150 times as long as Baseball base distances
In other words, 4 kilometers is 145.820 times the length of Baseball base distances, and the length of Baseball base distances is 0.0068578 times that amount.
(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 0.027432 kilometers. While second and home base are located upon the corners of the 27.432 sq. m area created by the bases, first and third base are placed within that square, to better allow the umpires to judge whether a ball is fair or foul.
It's about 200 times as long as a Cricket Pitch
In other words, 4 kilometers is 198.8390 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 0.00502919 times that amount.
(per Marylebone Cricket Council / International Cricket Council Law #6)
The length of a cricket pitch, from one bowling crease to the other, is 0.0201168 kilometers. The wickets at either end of the pitch stand 0.00072 kilometers tall including the bails.
It's about 200 times as long as a Bowling Lane
In other words, 4 kilometers is 208.810 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.004789 times that amount.
(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 0.019156 kilometers. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.