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How long is 729 shackles?

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It's about 60 times as tall as The Eiffel Tower.
In other words, 729 shackles is 61.70 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 0.0162 times that amount.
(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 11.80 shackles 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 1.350 shackles or less.
It's about one-sixty-fifth as long as The Rhine.
In other words, the length of The Rhine is 66.20 times 729 shackles.
(a.k.a. Rhein, a.k.a. Rijn, a.k.a. Rhin, a.k.a. Rain, a.k.a. Reno, a.k.a. Rhenus, a.k.a. Ryn) (from near Reichenau, Switzerland through Hoek van Holland, Rotterdam, Netherlands)
The Rhine river runs 48,100 shackles in total length. The World War II Battle of Arnhem, as memorialized in the 1974 book and 1977 movie A Bridge Too Far, was the first of several attempts to capture key bridges across the Rhine, beginning with the Arnhem Bridge in the Netherlands.
It's about 70 times as long as The QE2.
In other words, 729 shackles is 68 times the length of The QE2, and the length of The QE2 is 0.0147 times that amount.
(a.k.a. RMS Queen Elizabeth 2) The QE2 has a total length of 10.70 shackles. During its voyaging lifetime from 1969 through 2008, it travelled more than 350,000,000 shackles, the furthest cumulative distance by any ship in modern history.
It's about 90 times as tall as The Golden Gate Bridge.
In other words, 729 shackles is 88.10 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 0.0114 times that amount.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 8.280 shackles 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 100 times as tall as The Space Needle.
In other words, 729 shackles is 109 times the height of The Space Needle, and the height of The Space Needle is 0.00917 times that amount.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 6.710 shackles 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 100 times as tall as St. Paul's Cathedral.
In other words, 729 shackles is 115 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 0.0087 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 6.340 shackles 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).
It's about one-one-hundredth as long as The Colorado River.
In other words, 729 shackles is 0.00858 times the length of The Colorado River, and the length of The Colorado River is 117 times that amount.
(a.k.a. Aha Kwahwat, a.k.a. Grand River, a.k.a. Tizon River, a.k.a. Tecon River, a.k.a. Tison River) (from Grand Lake, Colorado through the Gulf of California)
The Colorado River runs 84,900 shackles in length. Along this length, the river descends from its source, approximately 100 shackles above sea level in the Rocky Mountains, to its mouth in the Gulf of California.