It's about as long as The QE2
In other words, the length of The QE2 is 1.03 times 10.40 shackles.(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 nine-tenths as tall as The Eiffel Tower
In other words, 10.40 shackles is 0.8810 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 1.140 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-and-one-fourth times as tall as The Golden Gate Bridge
In other words, 10.40 shackles is 1.260 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 0.7940 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 three-fourths as tall as The Empire State Building
In other words, 10.40 shackles is 0.748780 times the height of The Empire State Building, and the height of The Empire State Building is 1.33550 times that amount.(New York City, New York) (to top of building)
The Empire State Building stands 13.8890 shackles 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 102
It's about one-and-a-half times as tall as The Space Needle
In other words, 10.40 shackles is 1.550 times the height of The Space Needle, and the height of The Space Needle is 0.6450 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 three-fifths as tall as The Petronas Twin Towers
In other words, 10.40 shackles is 0.63130 times the height of The Petronas Twin Towers, and the height of The Petronas Twin Towers is 1.5840 times that amount.(a.k.a. Menara Berkembar Petronas, a.k.a. Petronas Towers) (Kuala Lumpur, Malaysia) (to spire)
Each of the Petronas Towers stands 16.470 shackles 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 4.1920 shackles deep.
It's about one-and-two-thirds times as tall as St. Paul's Cathedral
In other words, the height of St. Paul's Cathedral is 0.610 times 10.40 shackles.(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).