It's about as tall as The Leaning Tower of Pisa.
In other words, the height of The Leaning Tower of Pisa is 1 times 123 cubits.(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
It's about as tall as The Cinderella Castle.
In other words, the height of The Cinderella Castle is 1.02 times 123 cubits.(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
It's about one-and-one-tenth times as tall as Nelson's Column.
In other words, 123 cubits is 1.089 times the height of Nelson's Column, and the height of Nelson's Column is 0.9183 times that amount.(London, England, United Kingdom) (from pedestal first step to tip of statue's hat)
It's about one-and-one-tenth times as tall as The Arc de Triomphe.
In other words, the height of The Arc de Triomphe is 0.91 times 123 cubits.(Paris, France)
It's about one-and-one-fifth times as tall as The Chicago Water Tower.
In other words, the height of The Chicago Water Tower is 0.833 times 123 cubits.(Chicago, Illinois)
It's about four-fifths as long as The Wingspan of a 747.
In other words, 123 cubits is 0.821 times the length of The Wingspan of a 747, and the length of The Wingspan of a 747 is 1.22 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)
It's about three-fourths as tall as a Giant Sequoia (tree).
In other words, the height of a Giant Sequoia (tree) is 1.4 times 123 cubits.(a.k.a. Sequoiadendron giganteum, a.k.a. Sierra redwood, a.k.a. Wellingtonia)