It's about one-and-seven-tenths times as long as Baseball base distances.
In other words, 821 nails is 1.71040 times the length of Baseball base distances, and the length of Baseball base distances is 0.584660 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 0.50460 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 1.9820 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 0.490 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 0.4470 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 2.240 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 2.332390 times the length of a Cricket Pitch, and the length of a Cricket Pitch is 0.4287450 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 352 nails. The wickets at either end of the pitch stand 12.59840 nails tall including the bails.
It's about two-fifths as long as a Football field.
In other words, 821 nails is 0.4276040 times the length of a Football field, and the length of a Football field is 2.338610 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-and-a-half times as long as a Bowling Lane.
In other words, 821 nails is 2.44940 times the length of a Bowling Lane, and the length of a Bowling Lane is 0.408260 times that amount.(USBC specifications; tenpin; including pin deck)
According to the United States Bowling Congress specifications, a tenpin bowling lane should measure 335.190 nails. In a Professional Bowling Association game, the lane must be lubricated by about 25 ml (0.85 fl. oz) of oil.