The Tokyo Marathon is unique: no other mass marathon in Japan has an extensive elite field, and no other elite marathon has such a huge mass participation field.
Inspired by the 1896 Olympic Games, the world's oldest annual marathon was founded in 1897 and has been run every year since.
Since 1981, the TCS London Marathon has grown to more than 39,000 starters and finishers, is viewed in more than 196 countries worldwide and watched by between four and five million viewers in the UK.
Kenya's Eliud Kipchoge smashed the world record at the 2018 BMW BERLIN-MARATHON, running 2:01:39 to chop over one minute off the mark set by Dennis Kimetto four years earlier on the same course.
More than 1.7 million spectators line the Chicago streets every autumn to cheer on a field of over 40,000 runners, who sweep through 29 different neighborhoods in the city.
Regarded as one of the world's greatest road races, the TCS New York City Marathon has seen more than one million runners cross the finish line in Central Park since it began in 1970.