It's about one-and-seven-tenths times as long as Baseball base distances.
In other words, 821 nails is 1.7104 times the length of Baseball base distances, and the length of Baseball base distances is 0.58466 times that amount.(MLB Official Baseball Rules specification)
According to MLB Official Baseball Rules, the distance between baseball diamond bases is 480 nails. 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 half as tall as The Statue of Liberty.
In other words, 821 nails is 0.5046 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 1.982 times that amount.(a.k.a. "Liberty Enlightening the World," a.k.a. La Liberté Éclairant le Monde) (Liberty Island, New York City, New York) (pedestal base to torch peak)
The Statue of Liberty reaches 1,627 nails including the pedestal. The statue was designed using an optical trick known as "forced perspective" to make the statue appear proportionally correct when viewed from its base and is, in actuality, disproportionately large at the top.
It's about half as tall as Big Ben.
In other words, 821 nails is 0.49 times the height of Big Ben, and the height of Big Ben is 2 times that amount.(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
The clock tower of the Palace of Westminster, which houses the bell known as "Big Ben," rises 1,700 nails. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about two-fifths as long as a Football (Soccer) Pitch.
In other words, 821 nails is 0.447 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 2.24 times that amount.(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 1,840 nails (when the Laws were originally, they used imperial measurements of 1,840 nails, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about two-and-a-half times as long as a Cricket pitch.
In other words, 821 nails is 2.33239 times the length of a Cricket pitch, and the length of a Cricket pitch is 0.428745 times that amount.(per Marylebone Cricket Council / International Cricket Council Law #7)
The length of a cricket pitch is 352 nails. The wickets at either end of the pitch stand 12.5984 nails tall including the bails.
It's about two-fifths as long as a Football field.
In other words, 821 nails is 0.427604 times the length of a Football field, and the length of a Football field is 2.33861 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 1,920 nails from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 160 nails farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about two-fifths as tall as St. Paul's Cathedral.
In other words, 821 nails is 0.4216 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 2.372 times that amount.(London, England, United Kingdom)
St. Paul's Cathedral measures 1,948 nails 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).