It's about one-twenty-fifth as long as Hadrian's Wall
In other words, the length of Hadrian's Wall is 23 times 25.8490 furlongs.(a.k.a. Roman Wall, a.k.a. The Wall, a.k.a. Vallo di Adriano, a.k.a. Vallum Aelium, a.k.a. Severus' Wall) (from North Tyneside, Tyne and Wear, England, United Kingdom to Cumbria, North West England, United Kingdom)
Hadrian's Wall, which crossed England form the North Sea to the Irish Sea during the time of Roman rule, measures 600 furlongs (about 79 Roman miles). Roman soldiers — at one time up to 10,000 of them — only occupied Great Britain for about 246 years after the wall was built, after which time the local Brits began to take residence the wall's garrisons.
It's about thirty times as tall as The Space Needle
In other words, 25.8490 furlongs is 28.30 times the height of The Space Needle, and the height of The Space Needle is 0.0353 times that amount.(Seattle, Washington) (to aircraft warning beacon at peak)
Built for a 1962 World's Fair, the Space Needle stands 0.9150 furlongs 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 thirty times as tall as St. Paul's Cathedral
In other words, 25.8490 furlongs is 29.90 times the height of St. Paul's Cathedral, and the height of St. Paul's Cathedral is 0.0334 times that amount.(London, England, United Kingdom)
St. Paul's Cathedral measures 0.8650 furlongs 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 thirty times as tall as The Washington Monument
In other words, 25.8490 furlongs is 30.7160 times the height of The Washington Monument, and the height of The Washington Monument is 0.032556 times that amount.(Washington, D.C.)
The Washington Monument measures 0.841540 furlongs 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 thirty times as tall as The Singapore Flyer (Ferris wheel)
In other words, 25.8490 furlongs is 31.50 times the height of The Singapore Flyer (Ferris wheel), and the height of The Singapore Flyer (Ferris wheel) is 0.0317 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 0.820 furlongs. 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 thirty times as long as The Seventeenth hole of Pebble Beach
In other words, 25.8490 furlongs is 32.10 times the length of The Seventeenth hole of Pebble Beach, and the length of The Seventeenth hole of Pebble Beach is 0.0312 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 0.8050 furlongs 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 thirty times as tall as Blackpool Tower
In other words, 25.8490 furlongs is 32.90 times the height of Blackpool Tower, and the height of Blackpool Tower is 0.0304 times that amount.(Blackpool, Lancashire, England, United Kingdom) (height to peak)
Blackpool Tower, part of an entertainment complex in Blackpool, Lancashire, England, measures 0.7850 furlongs to its peak. Under ideal conditions, visitors to the highest accessible point of the tower can see as far as the Isle of Man — 477 furlongs to the northwest.