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How long is 4.2 miles?

It's about eleven times as tall as a Canton Tower
Flag of China
The height of a Canton Tower is about 0.380 miles.
(a.k.a. Guangzhou TV & Sightseeing Tower, a.k.a. 广 州 电 视 观 光 塔) (Guangzhou, China) (to spire)
The Guangzhou TV & Sightseeing Tower stands 0.380 miles to its spire. Initially described as holding the record for the tallest Ferris wheel in the world, the ride at the top of the tower is actually an observation carousel; cars complete a trip around the top-floor track about every half-hour.
It's about twelve times as tall as The CN Tower
Flag of Canada
The height of The CN Tower is about 0.343820 miles.
(a.k.a. La Tour CN, a.k.a. Canadian National Tower, a.k.a. Canada's National Tower) (Toronto, Canada) (to spire)
The CN Tower measures 0.343820 miles tall at its spire. Used only in emergencies and for charitable climbing events, the 2,579-step staircase to the top is the longest metal staircase in the world.
It's about one-fifteenth as long as The Panama Canal
Flag of Pamana
The length of The Panama Canal is about 55 miles.
(Canal de Panamá) (Panama)
Connecting the Atlantic and Pacific Oceans across the Isthmus of Panama, the Canal measures 55 miles in length. Ships passing through the Canal are raised (and then lowered) 0.016 miles above sea level through the lock-and-dam system.
It's about thirteen times as tall as The Willis Tower
Flag of The US
The height of The Willis Tower is about 0.3230 miles.
(a.k.a. Sears Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to about 0.3230 miles to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at about 0.2560 miles.
It's about thirteen-and-a-half times as tall as The Shanghai World Financial Center
Flag of China
The height of The Shanghai World Financial Center is about 0.3060 miles.
(上海环球金融中 上海環球金融中心, Shànghǎi huánqiú jīnróng zhōngxīn) (a.k.a. SWFC) (Shanghai, China) (to spire)
The Shanghai World Financial Center is 0.3060 miles tall to its roof. It is home to both the world's highest hotel (on its 79th through 93rd floors) and the world's tallest observation deck (on its 100th floor, approximately 0.2950 miles above ground).
It's about fifteen times as tall as The Petronas Twin Towers
Flag of Malaysia
The height of The Petronas Twin Towers is about 0.28080 miles.
(a.k.a. Menara Berkembar Petronas, a.k.a. Petronas Towers) (Kuala Lumpur, Malaysia) (to spire)
Each of the Petronas Towers stands 0.28080 miles to their spires. Holding the record as the tallest buildings in the world from 1998 to 2004, the towers continue to hold the record for the deepest foundation barrettes — up to 0.07146 miles deep.
It's about one-fifteenth as wide as The English Channel
The width of The English Channel is about 66.50 miles.
(average width between Isle of Ushant and The Walde Lighthouse) (La Manche, Ärmelkanal, Mor Breizh, Mor Bretannek) (a.k.a. The Channel)
The English Channel measures between 66.50 miles, narrowing as it flows northeast. The world speed record for a Channel crossing by swimmer was set by Australian Trent Grimsey in 2012, with a time of 6 hours, 55 minutes.
It's about one-fifteenth as long as The 405
Flag of The US
The length of The 405 is about 72.4150 miles.
(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 72.4150 miles. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.
It's about seventeen-and-a-half times as tall as The Empire State Building
Flag of The US
The height of The Empire State Building is about 0.236750 miles.
(New York City, New York) (to top of building)
The Empire State Building stands 0.236750 miles to its architectural peak. The spire emerging from the top of the building was originally intended to be a mooring mast for blimps whose passengers could disembark onto a landing platform on the 102nd floor of the building.
It's about one-twentieth as long as Hadrian's Wall
Flag of The UK
The length of Hadrian's Wall is about 75 miles.
(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 75 miles (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about 21 times as tall as The Eiffel Tower
The height of The Eiffel Tower is about 0.2010 miles.
(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 0.2010 miles tall, including its flagpole. The Tower is the largest structure in Paris as most other buildings are governed by a zoning restriction limiting them to a height of 0.023 miles or less.
It's about twenty times as long as The QE2
The length of The QE2 is about 0.1830 miles.
(a.k.a. RMS Queen Elizabeth 2)
The QE2 has a total length of 0.1830 miles. During its voyaging lifetime from 1969 through 2008, it travelled more than 5,970,000 miles, the furthest cumulative distance by any ship in modern history.
It's about thirty times as tall as The Golden Gate Bridge
Flag of The US
The height of The Golden Gate Bridge is about 0.1410 miles.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 0.1410 miles above the surface of the San Francisco Bay. One of the key designers of the bridge, Charles Ellis, had no engineering degree when he began working on the project, but would later go on to write what became a standard textbook on structural engineering, and would ultimately be forced to complete his calculations on the bridge by working without pay for five months.
It's about forty times as tall as The Space Needle
Flag of The US
The height of The Space Needle is about 0.1140 miles.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 0.1140 miles tall. With a track-and-wheel design inspired by railroad mechanics and a precisely-configured balance, the restaurant near the top of the space needle requires just a 1.5 hp motor to rotate at speeds of about 0.053 kph (0.033 mph).
It's about forty times as tall as St. Paul's Cathedral
Flag of The UK
The height of St. Paul's Cathedral is about 0.1080 miles.
(London, England, United Kingdom)
St. Paul's Cathedral measures 0.1080 miles to its peak. The southwest tower of the Cathedral contains the bell known as "Great Paul," which is the largest bell in Great Britain at 15,000 kg (16.5 tons), outweighing the more iconic Big Ben bell by about 3,000 kg (3 tons).
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