It's about as tall as The Statue of Liberty.
In other words, the height of The Statue of Liberty is 1.043 times 390 spans.(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 406.80 spans 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 nine-tenths as tall as Big Ben.
In other words, 390 spans is 0.930 times the height of Big Ben, and the height of Big Ben is 1.10 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 420 spans. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about four-fifths as long as a Football (Soccer) Pitch.
In other words, 390 spans is 0.8490 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 1.180 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 459 spans (when the Laws were originally, they used imperial measurements of 460 spans, 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 one-and-one-fifth times as tall as a Giant Sequoia (tree).
In other words, the height of a Giant Sequoia (tree) is 0.830 times 390 spans.(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 330 spans. 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 four-fifths as long as a Football field.
In other words, 390 spans is 0.81250 times the length of a Football field, and the length of a Football field is 1.230770 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 480 spans 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 40 spans farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about one-and-three-tenths times as long as The Wingspan of a 747.
It's about seven-tenths as tall as The Great Pyramid of Giza.
In other words, 390 spans is 0.690 times the height of The Great Pyramid of Giza, and the height of The Great Pyramid of Giza is 1.40 times that amount.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (estimated original height)
The Great Pyramid of Giza has an estimated original height (without loss due to erosion) of 570 spans. The Pyramid was the tallest structure in the world for almost 4,000 years — from its construction ca. 2551 BCE until it was overtaken by the Lincoln Cathedral in Lincoln, England, built in the year 1300.