It's about one-third as tall as The Singapore Flyer (Ferris wheel)
In other words, 55,000 milimeters is 0.3330 times the height of The Singapore Flyer (Ferris wheel), and the height of The Singapore Flyer (Ferris wheel) is 3 times that amount.(a.k.a. 新加坡摩天观景轮, a.k.a. சிங்கப்பூர் ஃப்ளையர், a.k.a. Pelayang Singapura) (Marina Centre, Singapore)
The Singapore Flyer has a height of 165,000 milimeters. Based on recommendations from Feng Shui masters, the wheel was re-engineered to spin in the opposite direction five months after it began operating.
It's about one-third as tall as The Washington Monument
In other words, 55,000 milimeters is 0.324890 times the height of The Washington Monument, and the height of The Washington Monument is 3.078 times that amount.(Washington, D.C.)
The Washington Monument measures 169,290 milimeters tall, with some discrepancy due to the fact that the Monument's base is slightly below the surrounding ground. Interrupted in its construction by the American Civil War, it was almost 36 years between groundbreaking and the completion of construction.
It's about three-tenths as tall as St. Paul's Cathedral
In other words, 55,000 milimeters is 0.3160 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 3.160 times that amount.(London, England, United Kingdom)
St. Paul's Cathedral measures 174,000 milimeters 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).
It's about three-tenths as tall as The Space Needle
In other words, 55,000 milimeters is 0.2990 times the height of The Space Needle, and the height of The Space Needle is 3.340 times that amount.(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 184,000 milimeters tall. With a track-and-wheel design inspired by railroad mechanics and a precisely-configured balance, the restaurant near the top of the space needle requires just a 1.5 hp motor to rotate at speeds of about 0.053 kph (0.033 mph).
It's about three-and-a-half times as tall as The Hollywood Sign
In other words, the height of The Hollywood Sign is 0.270 times 55,000 milimeters.(a.k.a. Hollywoodland Sign) (Mount Lee, Hollywood Hills, Santa Monica Mountains, California)
Each of the white letters in the Hollywood Sign measures 15,000 milimeters tall. Built as an advertisement in 1923, the sign was intended to stand for only eighteen months.
It's about four times as long as a Semitrailer
In other words, 55,000 milimeters is 3.7590 times the length of a Semitrailer, and the length of a Semitrailer is 0.2660 times that amount.(a.k.a. semi-trailer truck, a.k.a. semi, a.k.a. tractor-trailer, a.k.a. truck and trailer, a.k.a. eighteen-wheeler, a.k.a. big rig, a.k.a. Mack truck, a.k.a. transport, a.k.a. lorry, a.k.a. artic; for box truck; United States Federal length limits)
According to the United States Department of Transportation (DOT), the maximum allowable length of a semitrailer pulled by a road tractor truck is 14,630 milimeters (unless superseded by state law). These regulations also allow the vehicles to tow up to 36,000 kg in gross weight.
It's about one-fourth as tall as The Golden Gate Bridge
In other words, 55,000 milimeters is 0.2420 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 4.130 times that amount.(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 227,000 milimeters above the surface of the San Francisco Bay. One of the key designers of the bridge, Charles Ellis, had no engineering degree when he began working on the project, but would later go on to write what became a standard textbook on structural engineering, and would ultimately be forced to complete his calculations on the bridge by working without pay for five months.