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How long is 123 kilometers?

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It's about 250 times as tall as The Sears Tower.
In other words, 123 kilometers is 233 times the height of The Sears Tower, and the height of The Sears Tower is 0.00429 times that amount.
(a.k.a. Willis Tower) (Chicago, Illinois) (to antenna peak)
The Willis Tower rises to 0.5270 kilometers to the top of its tallest antenna. The bathrooms on the 103rd floor are said to be the highest in the western hemisphere at 0.4120 kilometers.
It's about 250 times as tall as The Taipei 101 (skyscraper).
In other words, 123 kilometers is 242 times the height of The Taipei 101 (skyscraper), and the height of The Taipei 101 (skyscraper) is 0.00413 times that amount.
(a.k.a. Taipei Financial Center, a.k.a. 台北101, a.k.a. 臺北101) (Xinyi District, Taipei, Taiwan) (to spire)
The Taipei 101 reaches 0.5080 kilometers to its spire. The tower itself is said to be the style in world's tallest sundial, with the circular area of the adjacent Millennium Park acting as the sundial's face.
It's about 250 times as tall as The Shanghai World Financial Center.
In other words, the height of The Shanghai World Financial Center is 0.004 times 123 kilometers.
(上海环球金融中 上海環球金融中心, Shànghǎi huánqiú jīnróng zhōngxīn) (a.k.a. SWFC) (Shanghai, China) (to spire)
The Shanghai World Financial Center is 0.4920 kilometers tall to its roof. It is home to both the world's highest hotel (on its 79th through 93rd floors) and the world's tallest observation deck (on its 100th floor, approximately 0.4740 kilometers above ground).
It's about 250 times as tall as The Petronas Twin Towers.
In other words, 123 kilometers is 272.20 times the height of The Petronas Twin Towers, and the height of The Petronas Twin Towers is 0.003674 times that amount.
(a.k.a. Menara Berkembar Petronas, a.k.a. Petronas Towers) (Kuala Lumpur, Malaysia) (to spire)
Each of the Petronas Towers stands 0.45190 kilometers to their spires. Holding the record as the tallest buildings in the world from 1998 to 2004, the towers continue to hold the record for the deepest foundation barrettes — up to 0.1150 kilometers deep.
It's about 300 times as tall as The Empire State Building.
In other words, 123 kilometers is 322.830 times the height of The Empire State Building, and the height of The Empire State Building is 0.0030976 times that amount.
(New York City, New York) (to top of building)
The Empire State Building stands 0.381010 kilometers to its architectural peak. The spire emerging from the top of the building was originally intended to be a mooring mast for blimps whose passengers could disembark onto a landing platform on the 102nd floor of the building.
It's about one-three-hundred-fiftieth as long as The Circumfrence of Earth.
In other words, 123 kilometers is 0.0030692441 times the length of The Circumfrence of Earth, and the length of The Circumfrence of Earth is 325.813120 times that amount.
(Equatorial)
The Earth — not a perfect sphere, but rather an oblate spheroid with bulged middle — has an Equatorial circumference of approximately 40,075.014 kilometers. The first airplane trip around the circumference of the Earth (with a few stops along the way), was completed in 1924 by the United States Army Air Service, and took 175 days.
It's about 400 times as tall as The Eiffel Tower.
In other words, 123 kilometers is 380 times the height of The Eiffel Tower, and the height of The Eiffel Tower is 0.00263 times that amount.
(a.k.a. La Tour Eiffel) (Paris, France) (to flagpole peak)
The Eiffel Tower stands 0.3240 kilometers tall, including its flagpole. The Tower is the largest structure in Paris as most other buildings are governed by a zoning restriction limiting them to a height of 0.037 kilometers or less.