It's about one-and-two-fifths times as tall as The Arc de Triomphe
In other words, the height of The Arc de Triomphe is 0.710 times 68,500 milimeters.(Paris, France)
The Arc de Triomphe stands 49,000 milimeters 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 seven-tenths as tall as Big Ben
In other words, 68,500 milimeters is 0.710 times the height of Big Ben, and the height of Big Ben is 1.40 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 96,000 milimeters. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.
It's about one-and-a-half times as tall as The Chicago Water Tower
In other words, 68,500 milimeters is 1.460 times the height of The Chicago Water Tower, and the height of The Chicago Water Tower is 0.6850 times that amount.(Chicago, Illinois)
The Chicago Water Tower is 46,900 milimeters 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 two-thirds as long as a Football (Soccer) Pitch
In other words, 68,500 milimeters is 0.6520 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 1.530 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 105,000 milimeters (when the Laws were originally, they used imperial measurements of 105,000 milimeters, 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-three-fifths times as long as Ha'Penny Bridge
In other words, the length of Ha'Penny Bridge is 0.6250 times 68,500 milimeters.(a.k.a. Droichead na Leathphingine, a.k.a. Liffey Bridge, a.k.a. Droichead na Life, f.k.a. Wellington Bridge) (Quay of Bachelors Walk, Temple Bar Neighborhood, Dublin, Ireland)
The Ha'Penny Bridge, crossing the River Liffey in Dublin, measures 42,900 milimeters in total length. Over 30,000 pedestrians cross the breach each day.
It's about three-fifths as long as a Football field
In other words, 68,500 milimeters is 0.6242710 times the length of a Football field, and the length of a Football field is 1.601870 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 109,728 milimeters 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 9,144 milimeters farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about half as tall as The Great Pyramid of Giza
In other words, 68,500 milimeters is 0.530 times the height of The Great Pyramid of Giza, and the height of The Great Pyramid of Giza is 1.90 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 130,000 milimeters. 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.