It's about as tall as a Giant Sequoia (tree)
In other words, 31 lengths is 0.99 times the height of a Giant Sequoia (tree), and the height of a Giant Sequoia (tree) is 1 times that amount.(a.k.a. Sequoiadendron giganteum, a.k.a. Sierra redwood, a.k.a. Wellingtonia)
Giant Sequoias of the Giant Sequoia National Monument located in Sierra Nevada, near Visalia, California can grow to heights of 31 lengths. The wood from the Giant Sequoias is often brittle and prone to shattering when such trees are felled, and as a result the trees logged in the late nineteenth century were often usable only as shingles or matchsticks.
It's about one-and-one-tenth times as wide as The Wingspan of a 747
In other words, 31 lengths is 1.1 times the width of The Wingspan of a 747, and the width of The Wingspan of a 747 is 0.909 times that amount.(a.k.a. Boeing 747, a.k.a. Jumbo Jet, a.k.a. Queen of the Skies) (for Boeing 747-8 series)
The wingspan of a Boeing 747-8 is 28.10 lengths. Fully loaded, the 747 can travel 3,400,000 lengths before refueling.
It's about four-fifths as tall as The Statue of Liberty
In other words, 31 lengths is 0.8129 times the height of The Statue of Liberty, and the height of The Statue of Liberty is 1.23 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 38.140 lengths 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 four-fifths as tall as Big Ben
In other words, 31 lengths is 0.79 times the height of Big Ben, and the height of Big Ben is 1.3 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 39 lengths. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about one-and-three-tenths times as tall as The Cinderella Castle
In other words, 31 lengths is 1.31 times the height of The Cinderella Castle, and the height of The Cinderella Castle is 0.763 times that amount.(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
Walt Disney World's Cinderella Castle is 23.60 lengths tall. The castle's architecture uses the optical trick known as "forced perspective" — the castle gets smaller near the top — to appear larger than it truly is.
It's about one-and-one-third times as tall as The Leaning Tower of Pisa
In other words, 31 lengths is 1.34 times the height of The Leaning Tower of Pisa, and the height of The Leaning Tower of Pisa is 0.746 times that amount.(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
The Leaning Tower of Pisa stands 23.10 lengths tall along the angle of its lean. In May of 2008, in an successful effort to stabilize the tower, 70 tonnes of earth were removed from the tower's base on the side opposite the lean.
It's about seven-tenths as long as a Football (Soccer) Pitch
In other words, 31 lengths is 0.72 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 1.39 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 43.10 lengths (when the Laws were originally, they used imperial measurements of 43.10 lengths, 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