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How long is 138 feet?

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It's about one-fourth as long as The Seventeenth hole of Pebble Beach.
In other words, 138 feet is 0.260 times the length of The Seventeenth hole of Pebble Beach, and the length of The Seventeenth hole of Pebble Beach is 3.850 times that amount.
(fully Pebble Beach Golf Links) (Pebble Beach; Monterey, California) (from Blue Tee)
The seventeenth hole on Pebble Beach Golf Links is a par 3 measuring 531 feet from the blue tee. This hole was the site of professional golfer Jack Nicklaus' 1972 U.S. Open win, which included a 1-iron shot that bounced off the hole's flag and resulted in a birdie.
It's about one-fourth as tall as The Singapore Flyer (Ferris wheel).
In other words, 138 feet is 0.2550 times the height of The Singapore Flyer (Ferris wheel), and the height of The Singapore Flyer (Ferris wheel) is 3.920 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 541 feet. 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-fourth as tall as The Washington Monument.
In other words, 138 feet is 0.248460 times the height of The Washington Monument, and the height of The Washington Monument is 4.0248 times that amount.
(Washington, D.C.)
The Washington Monument measures 555.410 feet 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 one-fourth as tall as St. Paul's Cathedral.
In other words, 138 feet is 0.2420 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 4.130 times that amount.
(London, England, United Kingdom)
St. Paul's Cathedral measures 571 feet 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 one-fourth as tall as The Space Needle.
In other words, 138 feet is 0.2290 times the height of The Space Needle, and the height of The Space Needle is 4.370 times that amount.
(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 604 feet 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 five times as long as a London bus.
In other words, 138 feet is 5.02 times the length of a London bus, and the length of a London bus is 0.1990 times that amount.
(Routemaster Double-Decker, RM standard specification)
The Routemaster Double-Decker buses, well-known as icons of London, measure 27.50 feet in length. The buses were said to be well-designed for travel in the London traffic, as they offered an open door for riders to board and exit even while the bus was moving at low speeds, and a full-time conductor to collect fares.
It's about one-fifth as tall as The Golden Gate Bridge.
In other words, 138 feet is 0.1850 times the height of The Golden Gate Bridge, and the height of The Golden Gate Bridge is 5.410 times that amount.
(San Francisco, California and Marin County, California) (height above water)
The height of each tower of Golden Gate Bridge is 745 feet 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.