It's about one-and-one-tenth times as long as The Preakness Stakes
In other words, 791 lengths is 1.00925 times the length of The Preakness Stakes, and the length of The Preakness Stakes is 0.99083480 times that amount.(Pimlico Race Course, Baltimore, Maryland) (total race length)
The total race length of the Preakness Stakes run at the Pimlico Race Course is 9.5 furlongs. Dubbed "the race for the Black-eyed Susans" after Maryland's state flower, the winning horse is actually draped with a garland of painted yellow daisies, as Black-eyed Susans do not bloom in time for the late-May race.
It's about as long as The Kentucky Derby
In other words, the length of The Kentucky Derby is 1.04298 times 791 lengths.(Churchill Downs, Louisville, Kentucky) (total race length)
The total race length of the Kentucky Derby run at Churchill Downs is 10 furlongs. First run in 1864, the Kentucky Derby is one of the oldest continuously-running sporting events in America, almost two years older than the Westminster Kennel Club Dog Show
It's about nine-tenths as long as The Beast (Roller Coaster)
In other words, 791 lengths is 0.85990 times the length of The Beast (Roller Coaster), and the length of The Beast (Roller Coaster) is 1.1630 times that amount.(King's Island Amusement Park; Mason, OH)
The roller coaster The Beast is 2,243 m 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 four-fifths as long as The Belmont Stakes
In other words, 791 lengths is 0.79898990 times the length of The Belmont Stakes, and the length of The Belmont Stakes is 1.251580 times that amount.(Belmont Park, Elmont, New York) (total race length)
The total race length of the Belmont Stakes run at Belmont Park is 12 furlongs. It was during the 1974 Belmont Stakes that Secretariat set an America Grade 1 stakes record in winning by a distance of about 31 lengths
It's about four-fifths as long as Steel Dragon 2000
In other words, 791 lengths is 0.7780 times the length of Steel Dragon 2000, and the length of Steel Dragon 2000 is 1.2850 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 2,479 m in length. It is one of only two operating "Gigacoasters" (meaning its height is between 300 ft and 399 ft) in the world, having a height of 97 m.
It's about three-fifths as long as The National Mall
In other words, the length of The National Mall is 2 times 791 lengths.(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 twice as tall as Angel Falls
In other words, 791 lengths is 1.970 times the height of Angel Falls, and the height of Angel Falls is 0.5080 times that amount.(a.k.a. Parakupa-vena, a.k.a. Kerepakupai mer&) (Auyantepui, Canaima National Park, Venezuela) (total height)
Angel Falls has a total height 979 m. Jimmie Angel, the first person to publicize their existence outside Venezuela and the namesake of the falls, damaged his monoplane atop the falls and was forced to abandon it; it remained there until it was removed 33 years later.