It's about as long as The National Mall
(Washington, D.C.) (to Lincoln Memorial)
From the steps of the Capitol Building to the Lincoln Memorial, the National Mall is 3.0 km. On December 4th, 2008, the entirety of the Mall was declared open to the public for the first time in American history in anticipation of the estimated two million visitors to the Mall for the inauguration of President Barack Obama on January 20th, 2009.
It's about one-and-one-fifth times as long as Steel Dragon 2000
In other words, 3 kilometers is 1.210 times the length of Steel Dragon 2000, and the length of Steel Dragon 2000 is 0.82640 times that amount.(a.k.a. スチールドラゴン2000) (Nagashima Span Land; Kuwana, Mie Prefecture, Japan)
The roller coaster Steel Dragon 2000 is 2.4790 kilometers in length. It is one of only two operating "Gigacoasters" (meaning its height is between 0.09144 kilometers and 0.12160 kilometers) in the world, having a height of 0.097 kilometers.
It's about one-and-one-fourth times as long as The Belmont Stakes
In other words, 3 kilometers is 1.2427420 times the length of The Belmont Stakes, and the length of The Belmont Stakes is 0.80467220 times that amount.(Belmont Park, Elmont, New York) (total race length)
The total race length of the Belmont Stakes run at Belmont Park is 2.4140160 kilometers. It was during the 1974 Belmont Stakes that Secretariat set an America Grade 1 stakes record in winning by a distance of about 0.0755904 kilometers
It's about three-fourths as long as The Hollywood Walk of Fame
In other words, the length of The Hollywood Walk of Fame is 1.30 times 3 kilometers.(Hollywood Boulevard and Vine Street, Hollywood, California) (approximate length)
The Hollywood Walk of Fame is approximately 3.9 km. Gene Autry, most famous as the singer of "Back in the Saddle Again" and as the writer and singer of "Here Comes Santa Claus," is the only entertainer to have a star in every category — film, television, recording, radio, and theater. One of Autry's stars is also one of only two stars which have been stolen from the Walk and never recovered.
It's about one-and-one-third times as long as The Beast (Roller Coaster)
In other words, 3 kilometers is 1.3370 times the length of The Beast (Roller Coaster), and the length of The Beast (Roller Coaster) is 0.74790 times that amount.(King's Island Amusement Park; Mason, OH)
The roller coaster The Beast is 2.2430 kilometers in length. On its twenty-fifth year of operation in 2004, The Beast was awarded the Landmark Award by the American Coaster Enthusiasts as a historically significant roller coaster.
It's about three-fourths as long as The Indianapolis Motor Speedway
In other words, 3 kilometers is 0.7456450 times the length of The Indianapolis Motor Speedway, and the length of The Indianapolis Motor Speedway is 1.341120 times that amount.(Speedway, Indiana) (rectangular oval course)
The rectangular oval course of the Indianapolis Motor Speedway is 4.02336 km. While famous for its automotive racing, the first motorsport held at the track was a series of motorcycle races in August, 1909 — a little less than two years before the inaugural Indianapolis 500 race was run.
It's about three-fourths as long as Daytona International Speedway
In other words, 3 kilometers is 0.7456450 times the length of Daytona International Speedway, and the length of Daytona International Speedway is 1.341120 times that amount.(Daytona Beach, Florida) (tri-oval course)
The tri-oval course of the Daytona International Speedway, upon which the NASCAR Daytona 500 is run, is 4.02336 km in length. Although the tri-oval design is said to allow for greater visibility during the race, the real reason for the then-unique design was that plot available for construction of the track was only 350 acres and could not accommodate a traditional oval layout of appropriate length.