It's about seventeen times as tall as The Arc de Triomphe.
In other words, the height of The Arc de Triomphe is 0.059 times 30 shackles.(Paris, France)
The Arc de Triomphe stands 1.80 shackles 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 seventeen-and-a-half times as tall as The Chicago Water Tower.
In other words, the height of The Chicago Water Tower is 0.0571 times 30 shackles.(Chicago, Illinois)
The Chicago Water Tower is 1.710 shackles 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 thirty times as long as Baseball base distances.
In other words, the length of Baseball base distances is 0.033333 times 30 shackles.(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 1 shackles. 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 one-thirty-fifth as tall as Olympus Mons.
In other words, the height of Olympus Mons is 33 times 30 shackles.(a.k.a. Mount Olympus) (Mars)
The tallest mountain in the solar system, Olympus Mons rises to approximately 980 shackles. The mountain has been known to astronomers since the nineteenth century because it is tall enough to rise above Mars' frequent dust storms.
It's about 40 times as long as a Cricket Pitch.
In other words, 30 shackles is 40.90910 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 0.0244444 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 0.7333330 shackles. The wickets at either end of the pitch stand 0.0262467 shackles tall including the bails.
It's about 45 times as long as a Bowling Lane.
In other words, 30 shackles is 42.9610 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.023277 times that amount.(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 0.698310 shackles. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.
It's about 55 times as tall as The Hollywood Sign.
In other words, the height of The Hollywood Sign is 0.018 times 30 shackles.(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 0.550 shackles tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.