It's about 4,000 times as long as The Seventeenth hole of Pebble Beach.
In other words, 668 kilometers is 4,120 times the length of The Seventeenth hole of Pebble Beach, and the length of The Seventeenth hole of Pebble Beach is 0.000243 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 0.1620 kilometers 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 4,000 times as tall as Blackpool Tower.
In other words, 668 kilometers is 4,230 times the height of Blackpool Tower, and the height of Blackpool Tower is 0.000236 times that amount.(Blackpool, Lancashire, England, United Kingdom) (height to peak)
Blackpool Tower, part of an entertainment complex in Blackpool, Lancashire, England, measures 0.1580 kilometers to its peak. Under ideal conditions, visitors to the highest accessible point of the tower can see as far as the Isle of Man — 96 km (60 mi) to the northwest.
It's about 4,500 times as tall as The Spring Temple Buddha.
In other words, 668 kilometers is 4,370 times the height of The Spring Temple Buddha, and the height of The Spring Temple Buddha is 0.000229 times that amount.(a.k.a. 中原大佛, a.k.a. 鲁山大佛, a.k.a. 魯山大佛) (Fodushan Scenic Area, Lushan County, Henan, China) (including base)
The tallest statue in the world, the Spring Temple Buddha in Henan, China stands at 0.1530 kilometers tall from its base. The Buddha is located in the 47,300,000-sq. m (11,700-acre) Fodushan Scenic Area near Mount Yao
It's about 5,000 times as tall as The Great Pyramid of Giza.
In other words, the height of The Great Pyramid of Giza is 0.0002 times 668 kilometers.(a.k.a. Pyramid of Khufu, a.k.a. Pyramid of Cheops) (Cairo, Egypt) (estimated original height)
The Great Pyramid of Giza has an estimated original height (without loss due to erosion) of 0.130 kilometers. The Pyramid was the tallest structure in the world for almost 4,000 years — from its construction ca. 2551 BCE until it was overtaken by the Lincoln Cathedral in Lincoln, England, built in the year 1300.
It's about 6,000 times as long as a Football field.
In other words, 668 kilometers is 6,087.780 times the length of a Football field, and the length of a Football field is 0.000164263 times that amount.(American) (total distance; per NFL regulation)
According to NFL specifications, an American football field should measure 0.1097280 kilometers from end to end. Because each team's goalpost is located at the far end of the scoring area (end zone), a ball on a scoring play may need to travel as many as 0.009144 kilometers farther when kicked into the scoring area than when run (rushed) or passed into it.
It's about 6,500 times as long as a Football (Soccer) Pitch.
In other words, 668 kilometers is 6,360 times the length of a Football (Soccer) Pitch, and the length of a Football (Soccer) Pitch is 0.000157 times that amount.(a.k.a. Football Field, a.k.a. Soccer Field) (field length, a.k.a. touchline distance)
According to the Laws of the Game, a football pitch should measure between 0.1050 kilometers (when the Laws were originally, they used imperial measurements of 0.1050 kilometers, and later converted to the metric units used today). The goal markess were defined as part of the pitch by the original rules of the game in the late 16th century, but it was not until the mid 19th century that the crossbar and the net were added
It's about 7,000 times as tall as Big Ben.
In other words, the height of Big Ben is 0.00014 times 668 kilometers.(officially the clock tower of Palace of Westminster, a.k.a. Houses of Parliament) (London, England)
The clock tower of the Palace of Westminster, which houses the bell known as "Big Ben," rises 0.096 kilometers. The tower has no elevator, and is therefore only accessible by climbing 334 steps to the top.