It's about as tall as The Leaning Tower of Pisa.
In other words, the height of The Leaning Tower of Pisa is 1.02 times 181 feet.(a.k.a. The Tower of Pisa, a.k.a. Torre pendente di Pisa) (Pisa, Italy) (height along center axis)
The Leaning Tower of Pisa stands 185 feet tall along the angle of its lean. In May of 2008, in an successful effort to stabilize the tower, 70 tonnes of earth were removed from the tower's base on the side opposite the lean.
It's about as tall as The Cinderella Castle.
In other words, the height of The Cinderella Castle is 1.04 times 181 feet.(Fantasyland, Magic Kingdom, Walt Disney World, Lake Buena Vista and Bay Lake, Florida)
Walt Disney World's Cinderella Castle is 189 feet tall. The castle's architecture uses the optical trick known as "forced perspective" — the castle gets smaller near the top — to appear larger than it truly is.
It's about one-and-one-tenth times as tall as Nelson's Column.
In other words, 181 feet is 1.068 times the height of Nelson's Column, and the height of Nelson's Column is 0.93630 times that amount.(London, England, United Kingdom) (from pedestal first step to tip of statue's hat)
Nelson's Column measures 169.40 feet from the first step of the pedestal's base to the top of the statue's hat. While the London tower is the tallest, there are at least eight other monuments to Admiral Horatio Nelson, 1st Viscount Nelson, 1st Duke of Bronté throughout England, Scotland, Ireland, Canada, and Barbados.
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 0.910 times 181 feet.(Paris, France)
The Arc de Triomphe stands 160 feet 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 one-and-one-fifth times as tall as The Chicago Water Tower.
In other words, 181 feet is 1.180 times the height of The Chicago Water Tower, and the height of The Chicago Water Tower is 0.8470 times that amount.(Chicago, Illinois)
The Chicago Water Tower is 154 feet 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 four-fifths as long as The Wingspan of a 747.
In other words, 181 feet is 0.8050 times the length of The Wingspan of a 747, and the length of The Wingspan of a 747 is 1.240 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)
The wingspan of a Boeing 747-8 is 225 feet. Fully loaded, the 747 can travel 27,200,000 feet before refueling.
It's about three-fourths as tall as a Giant Sequoia (tree).
In other words, the height of a Giant Sequoia (tree) is 1.40 times 181 feet.(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 250 feet. 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.